SpringCloud - 待整理

# 1.微服务架构零基础理论入门（小白必看）

# 回顾2018年第一季SpringCloud版本

别再用了

# 2.从2.2.x和H版开始说起

# 本次的SpringCloud第二季分为上半场和下半场

上篇
- SpringBoot2.X版和SpringCloud H版
下篇
- SpringCloud Alibaba
大纲

# Springboot版本选择

git源码地址：
- https://github.com/spring-projects/spring-boot/releases/
SpringBoot2.0新特性：
- https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Release-Notes
通过上面官网发现，Boot官方强烈建议你升级到2.X以上版本
官网看Boot版本
- springboot(截至2019.10.26)
- springboot(截至2020.2.15)

# SpringCloud版本选择

git源码地址
- https://github.com/spring-projects/spring-cloud/wiki
官网：
- https://spring.io/projects/spring-cloud
官网看Cloud版本
- Cloud命名规则 SpringCloud的多版本
- springcloud(截至2019.10.26)
- springboot(截至2020.2.15)

# SpringCloud和Springboot之间的依赖关系如何看

https://spring.io/projects/spring-cloud#overview
依赖
更详细的版本对应查看方法
- https://start.spring.io/actuator/info
  - 结果
- 查看json串返回结果

# SpringCloud第二季定稿版（截止2020.2.15）

cloud
- Hoxton.SR1
boot
- 2.2.2.RELEASE
cloud Alibaba
- 2.1.0.RELEASE
java
- JAVA8
maven
- 3.5及以上
mysql
- 5.7及以上
不许捣蛋，上述全部版本必须和阳哥一致
题外话
- boot版已经到2.2.4为最新，为什么选2.2.2？
  - 只用boot，直接用最新
    - Subtopic
  - 同时用boot和cloud，需要照顾cloud，由cloud决定boot版本
    - 结果
  - SpringCloud和SpringBoot版本对应关系
- 2.X版本常用的组件pom

# 3.关于Cloud各种组件的停更/升级/替换

# 由停更引发的“升级惨案”

停更不停用
- 被动修复bugs
- 不再接受合并请求
- 不再发布新版本
补充，哈哈
- 停课不停学
明细条目
- 以前
- now2020

# 参考资料见官网

Spring Cloud
- https://cloud.spring.io/spring-cloud-static/Hoxton.SR1/reference/htmlsingle/
- Spring Cloud中文文档
  - https://www.bookstack.cn/read/spring-cloud-docs/docs-index.md
Spring Boot
- https://docs.spring.io/spring-boot/docs/2.2.2.RELEASE/reference/htmlsingle/

# 4.微服务架构编码构建

# 约定 > 配置 > 编码

# IDEA新建project工作空间

微服务cloud整体聚合父工程Project

父工程步骤
- 1.New Project
- 2.聚合总工程名字
- 3.Maven选版本
- 4.工程名字
- 5.字符编码
- 6.注解生效激活
- 7.java编译版本选8
- 8.File Type过滤 .hprof;.idea;.iml;.pyc;.pyo;.rbc;.yarb;~;.DS_Store;.git;.hg;.svn;CVS;pycache;_svn;vssver.scc;vssver2.scc;

父工程POM

代码语言：javascript复制

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>com.atguigu.springcloud</groupId>  <artifactId>cloud2020</artifactId>  <version>1.0-SNAPSHOT</version>  <packaging>pom</packaging>  <!-- 统一管理jar包版本 -->  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <maven.compiler.source>1.8</maven.compiler.source>    <maven.compiler.target>1.8</maven.compiler.target>    <junit.version>4.12</junit.version>    <log4j.version>1.2.17</log4j.version>    <lombok.version>1.16.18</lombok.version>    <mysql.version>5.1.47</mysql.version>    <druid.version>1.1.16</druid.version>    <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>  </properties>  <!-- 子模块继承之后，提供作用：锁定版本 子modlue不用写groupId和version  -->  <dependencyManagement>    <dependencies>      <!--spring boot 2.2.2-->      <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-dependencies</artifactId>        <version>2.2.2.RELEASE</version>        <type>pom</type>        <scope>import</scope>      </dependency>      <!--spring cloud Hoxton.SR1-->      <dependency>        <groupId>org.springframework.cloud</groupId>        <artifactId>spring-cloud-dependencies</artifactId>        <version>Hoxton.SR1</version>        <type>pom</type>        <scope>import</scope>      </dependency>      <!--spring cloud alibaba 2.1.0.RELEASE-->      <dependency>        <groupId>com.alibaba.cloud</groupId>        <artifactId>spring-cloud-alibaba-dependencies</artifactId>        <version>2.1.0.RELEASE</version>        <type>pom</type>        <scope>import</scope>      </dependency>      <dependency>        <groupId>mysql</groupId>        <artifactId>mysql-connector-java</artifactId>        <version>${mysql.version}</version>      </dependency>      <dependency>        <groupId>com.alibaba</groupId>        <artifactId>druid</artifactId>        <version>${druid.version}</version>      </dependency>      <dependency>        <groupId>org.mybatis.spring.boot</groupId>        <artifactId>mybatis-spring-boot-starter</artifactId>        <version>${mybatis.spring.boot.version}</version>      </dependency>      <dependency>        <groupId>junit</groupId>        <artifactId>junit</artifactId>        <version>${junit.version}</version>      </dependency>      <dependency>        <groupId>log4j</groupId>        <artifactId>log4j</artifactId>        <version>${log4j.version}</version>      </dependency>      <dependency>        <groupId>org.projectlombok</groupId>        <artifactId>lombok</artifactId>        <version>${lombok.version}</version>        <optional>true</optional>      </dependency>    </dependencies>  </dependencyManagement>  <build>    <plugins>      <plugin>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-maven-plugin</artifactId>        <configuration>          <fork>true</fork>          <addResources>true</addResources>        </configuration>      </plugin>    </plugins>  </build></project>

解决maven下载不了jar的问题请复制这个链接到浏览器自行解决：

https://blog.csdn.net/HeyWeCome/article/details/104543411

Maven工程落地细节复习

Maven中的dependencyManagement和dependencies
maven中跳过单元测试

父工程创建完成执行mvn:install将父工程发布到仓库方便子工程继承

# Rest微服务工程构建

构建步骤

1.cloud-provider-payment8001微服务提供者支付Module模块

建cloud-provider-payment8001

创建完成后请回到父工程查看pom文件变化

改POM文件

代码语言：javascript复制

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>cloud2020</artifactId>        <groupId>com.atguigu.springcloud</groupId>        <version>1.0-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>    <artifactId>cloud-provider-payment8001</artifactId>    <dependencies>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->        <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>druid-spring-boot-starter</artifactId>            <version>1.1.10</version>        </dependency>        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-jdbc -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-jdbc</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>           <scope>runtime</scope>            <optional>true</optional>        </dependency>        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>            <optional>true</optional>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>    </dependencies></project>

写YML

代码语言：javascript复制

server:  port: 8001spring:  application:    name: cloud-payment-service  datasource:    type: com.alibaba.druid.pool.DruidDataSource    driver-class-name: org.gjt.mm.mysql.Driver    url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=utf-8&useSSL=false    username: root    password: 123456mybatis:  mapperLocations: classpath:mapper/*.xml  type-aliases-package: com.atguigu.springcloud.entities

主启动

业务类

1.建表SQL

代码语言：javascript复制

CREATE TABLE payment ( id BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT ID, 'serial' VARCHAR(200) DEFAULT, PRIMARY KEY(id)) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8

2.entitles

主实体Payment

代码语言：javascript复制

package com.atguigu.springcloud.entities;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import java.io.Serializable;@Data@AllArgsConstructor@NoArgsConstructorpublic class Payment implements Serializable {    private Long id;    private String serial;}

Json封装体CommonResult

代码语言：javascript复制

package com.atguigu.springcloud.entities;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@AllArgsConstructor@NoArgsConstructorpublic class CommonResult <T>{    private Integer code;    private String message;    private T data;    public CommonResult(Integer code,String message){        this(code,message,null);    }}

3.dao

接口PaymentDao

mybatis的映射文件PaymentMapper.xml

路径

srcmainresourcesmapperPaymentMapper.xml

文件头

代码语言：javascript复制

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.atguigu.springcloud.dao.PaymentDao"></mapper>

PaymentMapper.xml

代码语言：javascript复制

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.atguigu.springcloud.dao.PaymentDao">    <insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">            insert into payment(serial) values(${serial});    </insert>    <resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">        <id column="id" property="id" jdbcType="BIGINT"></id>        <id column="serial" property="serial" jdbcType="VARCHAR"></id>    </resultMap>    <select id="getPaymentById"  parameterType="Long" resultMap="BaseResultMap">            select * from payment where id=#{id}    </select></mapper>

4.service

接口PaymentService

代码语言：javascript复制

package com.atguigu.springcloud.service;import com.atguigu.springcloud.entities.Payment;import org.apache.ibatis.annotations.Param;public interface PaymentService {    public int create(Payment payment); //写    public Payment getPaymentById(@Param("id") Long id);  //读取}

实现类

代码语言：javascript复制

package com.atguigu.springcloud.service.impl;import com.atguigu.springcloud.dao.PaymentDao;import com.atguigu.springcloud.entities.Payment;import com.atguigu.springcloud.service.PaymentService;import org.apache.ibatis.annotations.Param;import org.springframework.stereotype.Service;import javax.annotation.Resource;@Servicepublic class PaymentServiceImpl implements PaymentService {    @Resource    private PaymentDao paymentDao;    public int create(Payment payment){        return paymentDao.create(payment);    }    public Payment getPaymentById( Long id){        return paymentDao.getPaymentById(id);    }}

5.controller

代码语言：javascript复制

package com.atguigu.springcloud.controller;import com.atguigu.springcloud.entities.CommonResult;import com.atguigu.springcloud.entities.Payment;import com.atguigu.springcloud.service.PaymentService;import lombok.extern.slf4j.Slf4j;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;@RestController@Slf4jpublic class PaymentController {    @Resource    private PaymentService paymentService;    @PostMapping(value = "/payment/create")    public CommonResult create(Payment payment){       int result = paymentService.create(payment);       log.info("*****插入结果：" result);       if (result>0){  //成功           return new CommonResult(200,"插入数据库成功",result);       }else {           return new CommonResult(444,"插入数据库失败",null);       }    }    @GetMapping(value = "/payment/get/{id}")    public CommonResult getPaymentById(@PathVariable("id") Long id){        Payment payment = paymentService.getPaymentById(id);        log.info("*****查询结果：" payment);        if (payment!=null){  //说明有数据，能查询成功            return new CommonResult(200,"查询成功",payment);        }else {            return new CommonResult(444,"没有对应记录，查询ID：" id,null);        }    }}

测试

http://localhost:8001/payment/get/31
postman模拟post
运行
- 通过修改idea的workpace.xml的方式来快速打开Run DashBoard窗口
- 开启Run DashBoard 填入以下内容：<option name="configurationTypes"> <set> <option value="SpringBootApplicationConfigurationType" /> </set> </option>
- 部分同学可能由于idea版本不同，需要关闭重启

小总结

1.建module
2.改POM
3.写YML
4.主启动
5.业务类

2.热部署Devtools

1.Adding devtools to your project

代码语言：javascript复制

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools --><dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-devtools</artifactId>   <scope>runtime</scope>    <optional>true</optional></dependency>

2.Adding plugin to your pom.xml

下一段配置黏贴到父工程当中的pom里

代码语言：javascript复制

<build>  <plugins>    <plugin>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-maven-plugin</artifactId>      <configuration>        <fork>true</fork>        <addResources>true</addResources>      </configuration>    </plugin>  </plugins></build>

3.Enabling automatic build

4.Update the value of

5.重启IDEA

3.cloud-consumer-order80微服务消费者订单Module模块

建cloud-consumer-order80

改POM

代码语言：javascript复制

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>cloud2020</artifactId>        <groupId>com.atguigu.springcloud</groupId>        <version>1.0-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>    <artifactId>cloud-consumer-order80</artifactId>    <dependencies>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>            <scope>runtime</scope>            <optional>true</optional>        </dependency>        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>            <optional>true</optional>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>    </dependencies></project>

写YML

server: port: 80

主启动

代码语言：javascript复制

package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class OrderMain80 {    public static void main(String[] args) {        SpringApplication.run(OrderMain80.class,args);    }}

业务类

创建entities(将cloud-provider-payment8001工程下的entities包下的两个实体类复制过来)

首说RestTemplate

是什么
官网及使用官网地址：https://docs.spring.io/spring-framework/docs/5.2.2.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html

config配置类

ApplicationContextConfig

代码语言：javascript复制

package com.atguigu.springcloud.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.client.RestTemplate;@Configurationpublic class ApplicationContextConfig {    @Bean    public RestTemplate getRestTemplate(){        return new RestTemplate();    }}

创建controller

代码语言：javascript复制

package com.atguigu.springcloud.controller;import com.atguigu.springcloud.entities.CommonResult;import com.atguigu.springcloud.entities.Payment;import lombok.extern.slf4j.Slf4j;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;import javax.annotation.Resource;@RestController@Slf4jpublic class OrderController {    public static final String PAYMENT_URL = "http://localhost:8001";    @Resource    private RestTemplate restTemplate;    @GetMapping("/consumer/payment/create")    public CommonResult<Payment>   create(Payment payment){        return restTemplate.postForObject(PAYMENT_URL "/payment/create",payment,CommonResult.class);  //写操作    }    @GetMapping("/consumer/payment/get/{id}")    public CommonResult<Payment> getPayment(@PathVariable("id") Long id){        return restTemplate.getForObject(PAYMENT_URL "/payment/get/" id,CommonResult.class);    }}

测试

先启动cloud-provider-payment8001
再启动cloud-consumer-order80
http://localhost/consumer/payment/get/32
不要忘记@RequestBody注解

4.工程重构

观察问题

系统中有重复部分，重构

新建

cloud-api-commons

POM

代码语言：javascript复制

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>cloud2020</artifactId>        <groupId>com.atguigu.springcloud</groupId>        <version>1.0-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>    <artifactId>cloud-api-commons</artifactId>    <dependencies>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>            <scope>runtime</scope>            <optional>true</optional>        </dependency>        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>           <optional>true</optional>        </dependency>        <!-- https://mvnrepository.com/artifact/cn.hutool/hutool-all -->        <dependency>            <groupId>cn.hutool</groupId>            <artifactId>hutool-all</artifactId>            <version>5.1.0</version>        </dependency>    </dependencies></project>

entities

Payment实体

CommonResult通用封装类

maven命令clean install

订单80和支付8001分别改造

删除各自的原先有过的entities文件夹

各自黏贴POM内容

代码语言：javascript复制

<dependency>    <groupId>com.atguigu.springcloud</groupId>    <artifactId>cloud-api-commons</artifactId>    <version>${project.version}</version></dependency>

目前工程样图

# 5.Eureka服务注册与发现

# Eureka基础知识

什么是服务治理
什么是服务注册
Eureka两组件

# 单机Eureka构建步骤

IDEA生成eurekaServer端服务注册中心类似物业公司

建Module

cloud-eureka-server7001

改POM

代码语言：javascript复制

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>cloud2020</artifactId>        <groupId>com.atguigu.springcloud</groupId>        <version>1.0-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>    <artifactId>cloud-eureka-server7001</artifactId>    <dependencies>        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>        </dependency>        <dependency>            <groupId>com.atguigu.springcloud</groupId>            <artifactId>cloud-api-commons</artifactId>            <version>${project.version}</version>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>            <scope>runtime</scope>            <optional>true</optional>        </dependency>        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>        </dependency>        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>        </dependency>    </dependencies></project>

写YML

代码语言：javascript复制

server:  port: 7001eureka:  instance:    hostname: localhost  #eureka服务端的实例名字  client:    register-with-eureka: false    #表识不向注册中心注册自己    fetch-registry: false   #表示自己就是注册中心，职责是维护服务实例，并不需要去检索服务     service-url:      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/    #设置与eureka server交互的地址查询服务和注册服务都需要依赖这个地址

主启动

代码语言：javascript复制

package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;@EnableEurekaServer@SpringBootApplicationpublic class EurekaMain7001 {    public static void main(String[] args) {        SpringApplication.run(EurekaMain7001.class,args);    }}

测试

http://localhost:7001/
结果页面

EurekaClient端cloud-provider-payment8001将注册进EurekaServer成为服务提供者provider，类似尚硅谷学校对外提供授课服务

cloud-provider-payment8001

改POM

代码语言：javascript复制

<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>        </dependency>

写YML

代码语言：javascript复制

eureka:  client:    register-with-eureka: true    fetchRegistry: true    service-url:      defaultZone: http://localhost:7001/eureka

主启动

代码语言：javascript复制

package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@EnableEurekaClient@SpringBootApplicationpublic class PaymentMain8001 {    public static void main(String[] args) {        SpringApplication.run(PaymentMain8001.class,args);    }}

测试

先要启动EurekaServer
http://localhost:7001/
微服务注册名配置说明

自我保护机制

EurekaClient端cloud-consumer-order80将注册进EurekaServer成为服务消费者consumer,类似来尚硅谷上课消费的各位同学

cloud-consumer-order80

POM

代码语言：javascript复制

<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>        </dependency>

写YML

代码语言：javascript复制

spring:  application:    name: cloud-order-serviceeureka:  client:    register-with-eureka: true    fetchRegistry: true    service-url:      defaultZone: http://localhost:7001/eureka

主启动

代码语言：javascript复制

package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@EnableEurekaClient@SpringBootApplicationpublic class PaymentMain8001 {    public static void main(String[] args) {        SpringApplication.run(PaymentMain8001.class,args);    }}

测试

先要启动EurekaServer，7001服务
再要启动服务提供者provider，8001服务
eureka服务器
http://localhost/consumer/payment/get/31

bug

# 集群Eureka构建步骤

Eureka集群原理说明解决办法：搭建Eureka注册中心集群，实现负载均衡故障容错
EurekaServer集群环境构建步骤
- 参考cloud-eureka-server7001
- 新建cloud-eureka-server7002
- 改POM
- 修改映射配置
  - 找到C:WindowsSystem32driversetc路径下的hosts文件
    - Subtopic
  - 修改映射配置添加进hosts文件
    - 127.0.0.1 eureka7001.com
    - 127.0.0.1 eureka7002.com
- 写YML（以前单机）
  - 7001 server: port: 7001eureka: instance: hostname: eureka7001.com #eureka服务端的实例名字 client: register-with-eureka: false #表识不向注册中心注册自己 fetch-registry: false #表示自己就是注册中心，职责是维护服务实例，并不需要去检索服务 service-url: defaultZone: http://eureka7002.com:7002/eureka/ #设置与eureka server交互的地址查询服务和注册服务都需要依赖这个地址
  - 7002 server: port: 7002eureka: instance: hostname: eureka7002.com #eureka服务端的实例名字 client: register-with-eureka: false #表识不向注册中心注册自己 fetch-registry: false #表示自己就是注册中心，职责是维护服务实例，并不需要去检索服务 service-url: defaultZone: http://eureka7001.com:7001/eureka/ #设置与eureka server交互的地址查询服务和注册服务都需要依赖这个地址
- 主启动(复制cloud-eureka-server7001的主启动类到7002即可)
将支付服务8001微服务发布到上面2台Eureka集群配置中
- YML service-url: defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka #集群版
将订单服务80微服务发布到上面2台Eureka集群配置中
- YML service-url: defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka #集群版
测试01
- 先要启动EurekaServer，7001/7002服务
- 再要启动服务提供者provider，8001服务
- 再要启动消费者，80
- http://localhost/consumer/payment/get/31
支付服务提供者8001集群环境构建
- 参考cloud-provider-payment8001
- 新建cloud-provider-payment8002
- 改POM
- 写YML
  - 7001 server: port: 7001eureka: instance: hostname: eureka7001.com #eureka服务端的实例名字 client: register-with-eureka: false #表识不向注册中心注册自己 fetch-registry: false #表示自己就是注册中心，职责是维护服务实例，并不需要去检索服务 service-url: defaultZone: http://eureka7002.com:7002/eureka/ #设置与eureka server交互的地址查询服务和注册服务都需要依赖这个地址
  - 7002 server: port: 7002eureka: instance: hostname: eureka7002.com #eureka服务端的实例名字 client: register-with-eureka: false #表识不向注册中心注册自己 fetch-registry: false #表示自己就是注册中心，职责是维护服务实例，并不需要去检索服务 service-url: defaultZone: http://eureka7001.com:7001/eureka/ #设置与eureka server交互的地址查询服务和注册服务都需要依赖这个地址
- 主启动类
  - 找到C:WindowsSystem32driversetc路径下的hosts文件
    - Subtopic
  - 修改映射配置添加进hosts文件
    - 127.0.0.1 eureka7001.com
    - 127.0.0.1 eureka7002.com
- 修改8001/8002的Controller
  - 8001
  - 8002
负载均衡
- bug
  - 订单服务访问地址不能写死改为这个：public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";
- 使用@LoadBalanced注解赋予RestTemplate负载均衡的能力
- ApplicationContextBean
  - 提前说一下Ribbon的负载均衡功能
测试02
- 先要启动EurekaServer，7001/7002服务
- 再要启动服务提供者provider，8001/8002服务
- http://localhost/consumer/payment/get/31
- 结果
  - 负载均衡效果达到
  - 8001/8002端口交替出现
- Ribbon和Eureka整合后Consumer可以直接调用服务而不用再关心地址和端口号，且该服务还有负载功能了

# actuator微服务信息完善

主机名称：服务名称修改
- 当前问题
- 修改cloud-provider-payment8001
  - YML
    - 修改部分 instance: instance-id: payment8001
    - 完整部分
- 修改之后
访问信息有ip信息提示
- 当前问题
  - 没有ip提示
- 修改cloud-provider-payment8001
  - YML
    - 修改部分 prefer-ip-address: true
    - 完整内容 eureka: client: register-with-eureka: true fetchRegistry: true service-url: defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka #集群版 instance: instance-id: payment8001 prefer-ip-address: true
- 修改之后

# 服务发现Discovery

对于注册进eureka里面的微服务，可以通过服务发现来获得该服务的信息
修改cloud-provider-payment8001的Controller @Resourceprivate DiscoveryClient discoveryClient;@GetMapping(value = "/payment/discovery")public Object discovery(){ List<String> services = discoveryClient.getServices(); for (String element : services) { log.info("***** element:" element); } List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE"); for (ServiceInstance instance : instances) { log.info(instance.getServiceId() "t" instance.getHost() "t" instance.getPort() "t" instance.getUri()); } return this.discoveryClient;}
8001主启动类
- @EnableDiscoveryClient
自测
- 先要启动EurekaServer，7001/7002服务
- 再启动8001主启动类，需要稍等一会
- http://localhost:8001/payment/discovery

# Eureka自我保护

故障现象
导致原因
- 一句话：某时刻某一个微服务不可用了，Eureka不会立刻清理，依旧会对该微服务的信息进行保存
- 属于CAP里面的AP分支
怎么禁止自我保护（一般生产环境中不会禁止自我保护）
- 注册中心eureakeServer端7001
  - 出厂默认，自我保护机制是开启的
    - eureka.server.enable-self-preservation = true
  - 使用eureka.server.enable-self-preservation = false可以禁用自我保护模式 server: enable-self-preservation: false eviction-interval-timer-in-ms: 2000
  - 关闭效果
  - 在eurekaServer端7001处设置关闭自我保护机制
- 生产者客户端eureakeClient端8001
  - 默认
    - eureka.instance.lease-renewal-interval-in-seconds=30
      - 单位为秒（默认是30秒）
    - eureka.instance.lease-expiration-duration-in-seconds=90
      - 单位为秒（默认是90秒）
  - 配置 instance: lease-renewal-interval-in-seconds: 1 lease-expiration-duration-in-seconds: 2
  - 测试
    - 7001和8001都配置完成
    - 先启动7001再启动8001
    - 先关闭8001
      - 马上被删除了

# 6.Zookeeper服务注册与发现

# Eureka停止更新了你怎么办

https://github.com/Netflix/eureka/wiki

# SpringCloud整合Zookeeper代替Eureka

注册中心Zookeeper
- zookeeper是一个分布式协调工具，可以实现注册中心功能
- 关闭Linux服务器防火墙后启动zookeeper服务器
- zookeeper服务器取代Eureka服务器，zk作为服务注册中心
服务提供者新建cloud-provider-payment8004 POM <?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <parent> <artifactId>cloud2020</artifactId> <groupId>com.atguigu.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>cloud-provider-payment8004</artifactId> <dependencies> <dependency> <groupId>com.atguigu.springcloud</groupId> <artifactId>cloud-api-commons</artifactId> <version>
服务消费者新建cloud-consumerzk-order80 POM <dependencies> <dependency> <groupId>com.atguigu.springcloud</groupId> <artifactId>cloud-api-commons</artifactId> <version>

# 7.Consul服务注册与发现

# Consul简介

是什么
- https://www.consul.io/intro/index.html
能干嘛 Spring Cloud Consul具有如下特性：
- 服务发现
  - 提供HTTP和DNS两种发现方式
- 健康监测
  - 支持多种协议，HTTP、TCP、Docker、Shell脚本定制化
- KV存储
  - key , Value的存储方式
- 多数据中心
  - Consul支持多数据中心
- 可视化Web界面
去哪下
- https://www.consul.io/downloads.html
怎么玩
- https://www.springcloud.cc/spring-cloud-consul.html

# 安装并运行Consul

官网安装说明
- https://learn.hashicorp.com/consul/getting-started/install.html
下载完成后只有一个consul.exe文件，硬盘路径下双击运行，查看版本信息
使用开发模式启动
- consul agent -dev
- 通过以下地址可以访问Consul的首页：http;//localhost:8500
- 结果页面

# 服务提供者

新建Module支付服务provider8006
- cloud-providerconsul-payment8006
POM <?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <parent> <artifactId>cloud2020</artifactId> <groupId>com.atguigu.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>cloud-providerconsul-payment8006</artifactId> <dependencies>  <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-consul-discovery</artifactId> </dependency> <dependency> <groupId>com.atguigu.springcloud</groupId> <artifactId>cloud-api-commons</artifactId> <version>${project.version}</version> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency>  <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies></project>
YML server: port: 8006spring: application: name: consul-provider-payment cloud: consul: host: localhost port: 8500 discovery: service-name: ${spring.application.name}
主启动类 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@SpringBootApplication@EnableDiscoveryClientpublic class PaymentMain8006 { public static void main(String[] args) { SpringApplication.run(PaymentMain8006.class,args); }}
业务类Controller package com.atguigu.springcloud.controller;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import java.util.UUID;@RestController@Slf4jpublic class PaymentController { @Value("${server.port}") private String serverPort; @GetMapping(value = "/payment/consul") public String paymentConsul(){ return "springcloud with consul: " serverPort "t" UUID.randomUUID().toString(); }}
验证测试
- http://localhost:8006/payment/consul

# 服务消费者

新建Module消费服务order8006
- cloud-consumerconsul-order80
POM <?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <parent> <artifactId>cloud2020</artifactId> <groupId>com.atguigu.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>cloud-consumerconsul-order80</artifactId> <dependencies>  <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-consul-discovery</artifactId> </dependency> <dependency> <groupId>com.atguigu.springcloud</groupId> <artifactId>cloud-api-commons</artifactId> <version>${project.version}</version> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency>  <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies></project>
YML server: port: 80spring: application: name: consul-consumer-order cloud: consul: host: localhost port: 8500 discovery: service-name: ${spring.application.name}
主启动类 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@SpringBootApplication@EnableDiscoveryClientpublic class OrderConsulMain80 { public static void main(String[] args) { SpringApplication.run(OrderConsulMain80.class,args); }}
配置Bean package com.atguigu.springcloud.config;import org.springframework.cloud.client.loadbalancer.LoadBalanced;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.client.RestTemplate;@Configurationpublic class ApplicationContextConfig { @LoadBalanced @Bean public RestTemplate getRestTemplate(){ return new RestTemplate(); }}
Controller package com.atguigu.springcloud.controller;import lombok.extern.slf4j.Slf4j;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;import javax.annotation.Resource;@RestController@Slf4jpublic class OrderConsulController { public static final String INVOME_URL = "http://consul-provider-payment"; @Resource private RestTemplate restTemplate; @GetMapping("/consumer/payment/consul") public String payment (){ String result = restTemplate.getForObject(INVOME_URL "/payment/consul",String.class); return result; }}
验证测试
访问测试地址
- http://localhost/consumer/payment/consul

# 三个注册中心异同点

CAP
- C:Consistency(强一致性)
- A:Availability(可用性)
- P:Partition tolerance(分区容错)
- CAP理论关注粒度是数据，而不是整体系统设计的策略
经典CAP图
- AP(Eureka)
- CP(Zookeeper/Consul)

# 8.Ribbon负载均衡服务调用

# 概述

是什么
官网资料
- https://github.com/Netflix/ribbon/wiki/Getting-Started
- Ribbon目前也进入维护模式
  - 未来替换方案
能干嘛
- LB（负载均衡）
  - 集中式LB
  - 进程内LB
- 前面我们讲解过了80通过轮询负载访问8001/8002
- 一句话
  - 负载均衡 RestTemplate调用

# Ribbon负载均衡演示

架构说明
- 总结：Ribbon其实就是一个软负载均衡的客户端组件，他可以和其他所需请求的客户端结合使用，和eureka结合只是其中的一个实例。
POM
二说RestTemplate的使用
- 官网 https://docs.spring.io/spring-framework/docs/5.2.2.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html
- getForObject方法/getForEntity方法
- postForObject/postForEntity
- GET请求方法
- POST请求方法

# Ribbon核心组件IRule

IRule:根据特定算法从服务列表中选取一个要访问的服务
- com.netflix.loadbalancer.RoundRobinRule
  - 轮询
- com.netflix.loadbalancer.RandomRule
  - 随机
- com.netflix.loadbalancer.RetryRule
  - 先按照RoundRobinRule的策略获取服务，如果获取服务失败则在指定时间内会进行重试
- WeightedResponseTimeRule
  - 对RoundRobinRule的扩展，响应速度越快的实例选择权重越大，越容易被选择
- BestAvailableRule
  - 会先过滤掉由于多次访问故障而处于断路器跳闸状态的服务，然后选择一个并发量最小的服务
- AvailabilityFilteringRule
  - 先过滤掉故障实例，再选择并发较小的实例
- ZoneAvoidanceRule
  - 默认规则，复合判断server所在区域的性能和server的可用性选择服务器
如何替换
- 修改cloud-consumer-order80
- 注意配置细节
- 新建package
  - com.atguigu.myrule
- 上面包下新建MySelfRule规则类 package com.atguigu.myrule;import com.netflix.loadbalancer.IRule;import com.netflix.loadbalancer.RandomRule;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class MySelfRule { @Bean public IRule myRule(){ return new RandomRule();//定义为随机 }}
- 主启动类添加@RibbonClient package com.atguigu.springcloud;import com.atguigu.myrule.MySelfRule;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.ribbon.RibbonClient;@EnableEurekaClient@SpringBootApplication@RibbonClient(name = "CLOUD-PAYMENT-SERVICE",configuration = MySelfRule.class)public class OrderMain80 { public static void main(String[] args) { SpringApplication.run(OrderMain80.class,args); }}
- 测试
  - http://localhost/consumer/payment/get/31

# Ribbon负载均衡算法

原理
RoundRobinRule源码
手写
- 自己试着写一个本地负载均衡器试试
  - 7001/7002集群启动
  - 8001/8002微服务改造
    - controller @GetMapping(value = "/payment/lb")public String getPaymentLB(){ return serverPort;}
  - 80订单微服务改造
    - 1.ApplicationContextBean去掉@LoadBalanced
    - 2.LoadBalancer接口 package com.atguigu.springcloud.lb;import org.springframework.cloud.client.ServiceInstance;import java.util.List;public interface LoadBalancer { //收集服务器总共有多少台能够提供服务的机器，并放到list里面 ServiceInstance instances(List<ServiceInstance> serviceInstances);}
    - 3.MyLB package com.atguigu.springcloud.lb;import org.springframework.cloud.client.ServiceInstance;import org.springframework.stereotype.Component;import java.util.List;import java.util.concurrent.atomic.AtomicInteger;@Componentpublic class MyLB implements LoadBalancer { private AtomicInteger atomicInteger = new AtomicInteger(0); //坐标 private final int getAndIncrement(){ int current; int next; do { current = this.atomicInteger.get(); next = current >= 2147483647 ? 0 : current 1; }while (!this.atomicInteger.compareAndSet(current,next)); //第一个参数是期望值，第二个参数是修改值是 System.out.println("*******第几次访问，次数next: " next); return next; } @Override public ServiceInstance instances(List<ServiceInstance> serviceInstances) { //得到机器的列表 int index = getAndIncrement() % serviceInstances.size(); //得到服务器的下标位置 return serviceInstances.get(index); }}
    - 4.OrderController package com.atguigu.springcloud.controller;import com.atguigu.springcloud.entities.CommonResult;import com.atguigu.springcloud.entities.Payment;import com.atguigu.springcloud.lb.LoadBalancer;import lombok.extern.slf4j.Slf4j;import org.springframework.cloud.client.ServiceInstance;import org.springframework.cloud.client.discovery.DiscoveryClient;import org.springframework.http.ResponseEntity;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;import javax.annotation.Resource;import java.net.URI;import java.util.List;@RestController@Slf4jpublic class OrderController { // public static final String PAYMENT_URL = "http://localhost:8001"; public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE"; @Resource private RestTemplate restTemplate; @Resource private LoadBalancer loadBalancer; @Resource private DiscoveryClient discoveryClient; @GetMapping("/consumer/payment/create") public CommonResult<Payment> create( Payment payment){ return restTemplate.postForObject(PAYMENT_URL "/payment/create",payment,CommonResult.class); //写操作 } @GetMapping("/consumer/payment/get/{id}") public CommonResult<Payment> getPayment(@PathVariable("id") Long id){ return restTemplate.getForObject(PAYMENT_URL "/payment/get/" id,CommonResult.class); } @GetMapping("/consumer/payment/getForEntity/{id}") public CommonResult<Payment> getPayment2(@PathVariable("id") Long id){ ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL "/payment/get/" id,CommonResult.class); if (entity.getStatusCode().is2xxSuccessful()){ // log.info(entity.getStatusCode() "t" entity.getHeaders()); return entity.getBody(); }else { return new CommonResult<>(444,"操作失败"); } } @GetMapping(value = "/consumer/payment/lb") public String getPaymentLB(){ List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE"); if (instances == null || instances.size() <= 0){ return null; } ServiceInstance serviceInstance = loadBalancer.instances(instances); URI uri = serviceInstance.getUri(); return restTemplate.getForObject(uri "/payment/lb",String.class); }}
    - 5.测试
      - http://localhost/consumer/payment/lb

# 9.OpenFeign服务接口调用

# 概述

OpenFeign是什么
- Feign是一个声明式的web服务客户端，让编写web服务客户端变得非常容易，只需创建一个接口并在接口上添加注解即可
- GitHub
  - https://github.com/spring-cloud/spring-cloud-openfeign
能干嘛
Feign和OpenFeign两者区别

# OpenFeign使用步骤

接口注解
- 微服务调用接口 @FeignClient
新建cloud-consumer-feign-order80
- Feign在消费端使用
  - Subtopic
POM <?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <parent> <artifactId>cloud2020</artifactId> <groupId>com.atguigu.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>cloud-consumer-feign-order80</artifactId>  <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>com.atguigu.springcloud</groupId> <artifactId>cloud-api-common</artifactId> <version>${project.version}</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies></project>
YML server: port: 80eureka: client: register-with-eureka: false service-url: defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka
主启动类 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.openfeign.EnableFeignClients;@SpringBootApplication@EnableFeignClientspublic class OrderFeignMain80 { public static void main(String[] args) { SpringApplication.run(OrderFeignMain80.class,args); }}
- @EnableFeignClients
业务类
- 业务逻辑接口 @FeignClient配置调用provider服务
- 新建PaymentFeignService接口并新增注解@FeignClient package com.atguigu.springcloud.service;import com.atguigu.springcloud.entities.CommonResult;import com.atguigu.springcloud.entities.Payment;import feign.Param;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.stereotype.Component;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;@Component@FeignClient(value = "CLOUD-PAYMENT-SERVICE")public interface PaymentFeignService { @GetMapping(value = "/payment/get/{id}") public CommonResult getPaymentById(@PathVariable("id") Long id);}
- 控制层Controller package com.atguigu.springcloud.controller;import com.atguigu.springcloud.entities.CommonResult;import com.atguigu.springcloud.entities.Payment;import com.atguigu.springcloud.service.PaymentFeignService;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;@RestControllerpublic class OrderFeignController { @Resource private PaymentFeignService paymentFeignService; @GetMapping(value = "/consumer/payment/get/{id}") public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id){ return paymentFeignService.getPaymentById(id); }}
测试
- 先启动2个eureka集群7001/7002
- 再启动2个微服务8001/8002
- 启动OpenFeign启动
- http://localhost/consumer/payment/get/31
- Feign自带负载均衡配置项
小总结

# OpenFeign超时控制

超时设置，故意设置超时演示出错情况
- 服务提供方8001故意写暂停程序 @GetMapping(value = "/payment/feign/timeout")public String paymentFeignTimeout(){ try { TimeUnit.SECONDS.sleep(3); }catch (Exception e) {e.printStackTrace();} return serverPort;}
- 服务消费方80添加超时方法PaymentFeignService @GetMapping(value = "/payment/feign/timeout")public String paymentFeignTimeout();
- 服务消费方80添加超时方法OrderFeignController @GetMapping(value = "/consumer/payment/feign/timeout")public String paymentFeignTimeout(){ return paymentFeignService.paymentFeignTimeout();}
- 测试
  - http://localhost/consumer/payment/feign/timeout
  - 错误页面
OpenFeign默认等待一秒钟，超过后报错
是什么
- OpenFeign默认支持Ribbon
YML文件里需要开启OpenFeign客户端超时控制 ribbon: ReadTimeout: 5000 ConnectTimeout: 5000

# OpenFeign日志打印功能

日志打印功能
是什么
日志级别
配置日志bean package com.atguigu.springcloud.config;import feign.Logger;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class FeignConfig { @Bean Logger.Level feignLoggerLevel(){ return Logger.Level.FULL; }}
YML文件里需要开启日志的Feign客户端 logging: level: com.atguigu.springcloud.service.PaymentFeignService: debug
后台日志查看

# 10.Hystrix断路器

# 概述

分布式系统面临的问题
是什么
能干嘛
- 服务降级
- 服务熔断
- 接近实时的监控
- 。。。。。
官网资料
- https://github.com/Netflix/Hystrix/wiki/How-To-Use
Hystrix官宣，停更进维
- https://github.com/Netflix/Hystrix
  - 被动修复bugs
  - 不再接受合并请求
  - 不再发布新版本

# Hystrix重要概念

服务降级
- 服务器忙，请稍候再试，不让客户端等待并立刻返回一个友好提示，fallback
- 哪些情况会触发降级
  - 程序运行异常
  - 超时
  - 服务熔断触发服务降级
  - 线程池/信号量打满也会导致服务降级
服务熔断
- 类比保险丝达到最大服务访问后，直接拒绝访问，拉闸限电，然后调用服务降级的方法并返回友好提示
- 就是保险丝
  - 服务的降级->进而熔断->恢复调用链路
服务限流
- 秒杀高并发等操作，严禁一窝蜂的过来拥挤，大家排队，一秒钟N个，有序进行

# hystrix案例

构建新建cloud-provider-hystrix-payment8001 POM <?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <parent> <artifactId>cloud2020</artifactId> <groupId>com.atguigu.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>cloud-provider-hystrix-payment8001</artifactId> <dependencies>  <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>com.atguigu.springcloud</groupId> <artifactId>cloud-api-commons</artifactId> <version>
高并发测试上述在非高并发情形下，还能勉强满足 but..... Jmeter压测测试开启Jmeter，来20000个并发压死8001，20000个请求都去访问paymentInfo_TimeOut服务再来一个访问 http://localhost:8001/payment/hystrix/ok/31 http://localhost:8001/payment/hystrix/timeout/31 看演示结果两个都在自己转圈圈为什么会被卡死 tomcat的默认的工作线程数被打满了，没有多余的线程来分解压力和处理。 Jmeter压测结论上面还是服务提供者8001自己测试，假如此时外部的消费者80也来访问，那消费者只能干等，最终导致消费端80不满意，服务端8001直接被拖死看热闹不嫌弃事大，80新建加入 cloud-consumer-feign-hystrix-order80 新建 cloud-consumer-feign-hystrix-order80 POM <?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <parent> <artifactId>cloud2020</artifactId> <groupId>com.atguigu.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>cloud-consumer-feign-hystrix-order80</artifactId> <dependencies>  <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>com.atguigu.springcloud</groupId> <artifactId>cloud-api-commons</artifactId> <version>
故障现象和导致原因
- 8001同一层次的其他接口服务被困死，因为tomcat线程里面的工作线程已经被挤占完毕
- 80此时调用8001，客户端访问响应缓慢，转圈圈
上诉结论
- 正因为有上述故障或不佳表现，才有我们的降级/容错/限流等技术诞生
如何解决？解决的要求
- 超时导致服务器变慢（转圈）
  - 超时不再等待
- 出错（宕机或程序运行出错）
  - 出错要有兜底
- 解决
  - 对方服务（8001）超时了，调用者（80）不能一直卡死等待，必须有服务降级
  - 对方服务（8001）down机了，调用者（80）不能一直卡死等待，必须有服务降级
  - 对方服务（8001）OK，调用者（80）自己出故障或有自我要求（自己的等待时间小于服务提供者），自己处理降级
服务降级
- 降低配置
  - @HystrixCommand
- 8001先从自身找问题
  - 设置自身调用超时时间的峰值，峰值内可以正常运行，超过了需要有兜底的方法处理，作服务降级fallback
- 8001fallback
  - 业务类启用
    - @HystrixCommand报异常后如何处理 package com.atguigu.springcloud.service;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;import org.springframework.stereotype.Service;import java.util.concurrent.TimeUnit;@Servicepublic class PaymentService { //成功 public String paymentInfo_OK(Integer id){ return "线程池：" Thread.currentThread().getName() " paymentInfo_OK,id： " id "t" "哈哈哈" ; } //失败 @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler",commandProperties = { @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value = "3000") //3秒钟以内就是正常的业务逻辑 }) public String paymentInfo_TimeOut(Integer id){ // int timeNumber = 5; int age = 10/0; // try { TimeUnit.SECONDS.sleep(timeNumber); }catch (Exception e) {e.printStackTrace();} //return "线程池：" Thread.currentThread().getName() " paymentInfo_TimeOut,id： " id "t" "呜呜呜" " 耗时(秒)" timeNumber; return "线程池：" Thread.currentThread().getName() " paymentInfo_TimeOut,id： " id "t" "呜呜呜" " 耗时(秒)"; } //兜底方法 public String paymentInfo_TimeOutHandler(Integer id){ return "线程池：" Thread.currentThread().getName() " 系统繁忙, 请稍候再试 ,id： " id "t" "哭了哇呜"; }}
      - 一旦调用服务方法失败并抛出了错误信息后，会自动调用@HystrixCommand标注好的fallbackMethod调用类中的指定方法
      - 图示
  - 主启动类激活
    - 添加新注解@EnableCircuitBreaker
- 80fallback
  - 80订单微服务，也可以更好的保护自己，自己也依样画葫芦进行客户端降级保护
  - 题外话，切记
    - 我们自己配置过的热部署方式对java代码的改动明显，但对@HystrixCommand内属性的修改建议重启微服务
  - YML feign: hystrix: enabled: true #如果处理自身的容错就开启。开启方式与生产端不一样。
  - 主启动
    - @EnableHystrix
  - 业务类 @GetMapping("/consumer/payment/hystrix/timeout/{id}")@HystrixCommand(fallbackMethod = "paymentTimeOutFallbackMethod",commandProperties = { @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value = "1500") //3秒钟以内就是正常的业务逻辑})public String paymentInfo_TimeOut(@PathVariable("id") Integer id){ String result = paymentHystrixService.paymentInfo_TimeOut(id); return result;}//兜底方法public String paymentTimeOutFallbackMethod(@PathVariable("id") Integer id){ return "我是消费者80，对付支付系统繁忙请10秒钟后再试或者自己运行出错请检查自己,(┬＿┬)";}
- 目前问题
  - 每个业务方法对应一个兜底的方法，代码膨胀
  - 统一和自定义的分开
- 解决问题
  - 每个方法配置一个？？？膨胀
    - feign接口系列
    - @DefaultProperties(defaultFallback = "")
      - 说明
    - controller配置 package com.atguigu.springcloud.controller;import com.atguigu.springcloud.service.PaymentHystrixService;import com.netflix.hystrix.contrib.javanica.annotation.DefaultProperties;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;import lombok.extern.slf4j.Slf4j;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;@RestController@Slf4j@DefaultProperties(defaultFallback = "payment_Global_FallbackMethod") //全局的public class OrderHystrixController { @Resource private PaymentHystrixService paymentHystrixService; @GetMapping("/consumer/payment/hystrix/ok/{id}") public String paymentInfo_OK(@PathVariable("id") Integer id){ String result = paymentHystrixService.paymentInfo_OK(id); return result; }// @GetMapping("/consumer/payment/hystrix/timeout/{id}")// public String paymentInfo_TimeOut(@PathVariable("id") Integer id){// String result = paymentHystrixService.paymentInfo_TimeOut(id);// return result;// } @GetMapping("/consumer/payment/hystrix/timeout/{id}")// @HystrixCommand(fallbackMethod = "paymentTimeOutFallbackMethod",commandProperties = {// @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value = "1500") //1.5秒钟以内就是正常的业务逻辑// }) @HystrixCommand public String paymentInfo_TimeOut(@PathVariable("id") Integer id){ int age = 10/0; String result = paymentHystrixService.paymentInfo_TimeOut(id); return result; } //兜底方法 public String paymentTimeOutFallbackMethod(@PathVariable("id") Integer id){ return "我是消费者80，对付支付系统繁忙请10秒钟后再试或者自己运行出错请检查自己,(┬＿┬)"; } //下面是全局fallback方法 public String payment_Global_FallbackMethod(){ return "Global异常处理信息，请稍后再试,(┬＿┬)"; }}
  - 和业务逻辑混一起？？？混乱
    - 服务降级，客户端去调用服务端，碰上服务端宕机或关闭
    - 本次案例服务降级处理是在客户端80实现完成的，与服务端8001没有关系，只需要为Feign客户端定义的接口添加一个服务降级处理的实现类即可实现解耦
    - 未来我们要面对的异常
      - 运行
      - 超时
      - 宕机
    - 再看我们的业务类PaymentController
    - 修改cloud-consumer-feign-hystrix-order80
    - 根据cloud-consumer-feign-hystrix-order80已经有的PaymentHystrixService接口，重新新建一个类（PaymentFallbackService）实现该接口，统一为接口里面的方法进行异常处理
    - PaymentFallbackService类实现PaymentFeignClientService接口 package com.atguigu.springcloud.service;import org.springframework.stereotype.Component;@Componentpublic class PaymentFallbackService implements PaymentHystrixService { @Override public String paymentInfo_OK(Integer id) { return "-----PaymentFallbackService fall back-paymentInfo_OK , (┬＿┬)"; } @Override public String paymentInfo_TimeOut(Integer id) { return "-----PaymentFallbackService fall back-paymentInfo_TimeOut , (┬＿┬)"; }}
    - YML feign: hystrix: enabled: true #如果处理自身的容错就开启。开启方式与生产端不一样。
    - PaymentFeignClientService接口 package com.atguigu.springcloud.service;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.stereotype.Component;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;@Component@FeignClient(value = "CLOUD-PROVIDER-HYSTRIX-PAYMENT",fallback = PaymentFallbackService.class)public interface PaymentHystrixService { @GetMapping("/payment/hystrix/ok/{id}") public String paymentInfo_OK(@PathVariable("id") Integer id); @GetMapping("/payment/hystrix/timeout/{id}") public String paymentInfo_TimeOut(@PathVariable("id") Integer id);}
    - 测试
      - 单个eureka先启动7001
      - PaymentHystrixMain8001启动
      - 正常访问测试
      - http://localhost/consumer/payment/hystrix/ok/31
      - 故意关闭微服务8001
      - 客户端自己调用提升
      - 此时服务端provider已经down了，但是我们做了服务降级处理，让客户端在服务端不可用时也会获得提示信息而不会挂起耗死服务器
服务熔断
- 断路器
  - 一句话就是家里保险丝
- 熔断是什么
  - 大神论文
    - https://martinfowler.com/bliki/CircuitBreaker.html
- 实操
  - 修改cloud-provider-hystrix-payment8001
  - PaymentService //服务熔断@HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = { @HystrixProperty(name = "circuitBreaker.enabled",value = "true"), //是否开启断路器 @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "10"), //请求次数 @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"), //时间范围 @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60"), //失败率达到多少后跳闸})public String paymentCircuitBreaker(@PathVariable("id") Integer id){ if (id < 0){ throw new RuntimeException("*****id 不能负数"); } String serialNumber = IdUtil.simpleUUID(); return Thread.currentThread().getName() "t" "调用成功,流水号：" serialNumber;}public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id){ return "id 不能负数，请稍候再试,(┬＿┬)/~~ id: " id;}
    - why配置这些参数
  - PaymentController //===服务熔断@GetMapping("/payment/circuit/{id}")public String paymentCircuitBreaker(@PathVariable("id") Integer id){ String result = paymentService.paymentCircuitBreaker(id); log.info("*******result:" result); return result;}
  - 测试
    - 自测cloud-provider-hystrix-payment8001
    - 正确
      - http://localhost:8001/payment/circuit/31
    - 错误
      - http://localhost:8001/payment/circuit/-31
    - 一次正确一次错误trytry
    - 重点测试
      - 多次错误,然后慢慢正确，发现刚开始不满足条件，就算是正确的访问地址也不能进行访问，需要慢慢的恢复链路
- 原理（小总结）
  - 大神结论
  - 熔断类型
    - 熔断打开
      - 请求不再进行调用当前服务，内部设置时钟一般为MTTR(平均故障处理时间)，当打开时长达到所设时钟则进入熔断状态
    - 熔断关闭
      - 熔断关闭不会对服务进行熔断
    - 熔断半开
      - 部分请求根据规则调用当前服务，如果请求成功且符合规则则认为当前服务恢复正常，关闭熔断
  - 官网断路器流程图
    - 官网步骤
    - 断路器在什么情况下开始起作用
    - 断路器开启或者关闭的条件
      - 当满足一定阀值的时候（默认10秒内超过20个请求次数）
      - 当失败率达到一定的时候（默认10秒内超过50%请求失败）
      - 到达以上阀值，断路器将会开启
      - 当开启的时候，所有请求都不会进行转发
      - 一段时间之后（默认是5秒），这个时候断路器是半开状态，会让其中一个请求进行转发。如果成功，断路器会关闭，若失败，继续开启。重复4和5
    - 断路器打开之后
    - All配置
服务限流
- 后面高级篇讲解alibaba的Sentinel说明

# hystrix工作流程

https://github.com/Netflix/Hystrix/wiki/How-it-Works
hystrix工作流程
- 官网图例
- 步骤说明

# 服务监控hystrixDashboard

概述
仪表盘9001
- 新建cloud-consumer-hystrix-dashboard9001
- POM <?xml version="1.0" encoding="UTF-8"?>cloud2020 com.atguigu.springcloud 1.0-SNAPSHOT 4.0.0 cloud-consumer-hystrix-dashboard9001 org.springframework.cloud spring-cloud-starter-netflix-hystrix-dashboard org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test
- YML server: port: 9001
- HystrixDashboardMain9001 新注解@EnableHystrixDashboard package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;@SpringBootApplication@EnableHystrixDashboardpublic class HystrixDashboardMain9001 { public static void main(String[] args) { SpringApplication.run(HystrixDashboardMain9001.class,args); }}
- 所有Provider微服务提供类（8001/8002/8003）都需要监控依赖配置 org.springframework.boot spring-boot-starter-actuator
- 启动cloud-consumer-hystrix-dashboard9001该微服务后续将监控微服务8001
  - http://localhost:9001/hystrix
断路器演示
- 修改cloud-provider-hystrix-payment8001
  - 注意：新版本Hystrix需要在主启动类MainAppHystrix8001中指定监控路径 @Beanpublic ServletRegistrationBean getServlet(){ HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet(); ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet); registrationBean.setLoadOnStartup(1); registrationBean.addUrlMappings("/hystrix.stream"); registrationBean.setName("HystrixMetricsStreamServlet"); return registrationBean;}
  - Unable to connect to Command Metric Stream
  - 404
- 监控测试
  - 启动1个eureka或者3个eureka集群均可
  - 观察监控窗口
    - 9001监控8001
      - 填写监控地址
      - http://localhost:8001/hystrix.stream
    - 测试地址
      - http://localhost:8001/payment/circuit/31
      - http://localhost:8001/payment/circuit/-31
      - 上述测试通过
      - ok
      - 先访问正确地址，再访问错误地址，再正确地址，会发现图示断路器都是慢慢放开的
      - 监控结果，成功
      - 监控结果，失败
    - 如何看
      - 7色
      - 1圈
      - 1线
      - 整图说明
      - 整图说明2
    - 搞懂一个才能看懂复杂的

# 11.zuul路由网关（没讲）

# 12.Gateway新一代网关

# 概述简介

官网
- 上一代zuul 1.X
  - https://github.com/Netflix/zuul/wiki
- 当前gateway
  - https://cloud.spring.io/spring-cloud-static/spring-cloud-gateway/2.2.1.RELEASE/reference/html/
是什么
- 概述
- 一句话
  - Spring Cloud Gateway 使用的Webflux中的reactor-netty响应式编程组件，底层使用了Netty通讯框架
  - 源码架构
能干嘛
- 反向代理
- 鉴权
- 流量控制
- 熔断
- 日志监控
- 。。。。。。
微服务架构中网关在哪里
有了Zuul了怎么又出来了gateway
- 我们为什么选择Gatway?
  - 1.neflix不太靠谱，zuul2.0一直跳票,迟迟不发布
  - 2.SpringCloud Gateway具有如下特性
  - 3.SpringCloud Gateway与Zuul的区别
- Zuul1.x模型
- GateWay模型
  - WebFlux是什么？
    - 说明

# 三大核心概念

Route(路由)
- 路由是构建网关的基本模块，它由ID，目标URI，一系列的断言和过滤器组成，如果断言为true则匹配该路由
Predicate（断言）
- 参考的是java8的java.util.function.Predicate开发人员可以匹配HTTP请求中的所有内容（例如请求头或请求参数），如果请求与断言相匹配则进行路由
Filter(过滤)
- 指的是Spring框架中GatewayFilter的实例，使用过滤器，可以在请求被路由前或者之后对请求进行修改。
总体

# Gateway工作流程

官网总结
核心逻辑
- 路由转发执行过滤器链

# 入门配置

新建Module
- cloud-gateway-gateway9527
- POM <?xml version="1.0" encoding="UTF-8"?>cloud2020 com.atguigu.springcloud 1.0-SNAPSHOT 4.0.0 cloud-gateway-gateway9527 org.springframework.cloud spring-cloud-starter-gateway com.atguigu.springcloud cloud-api-commons 1.0-SNAPSHOT org.springframework.cloud spring-cloud-starter-netflix-hystrix org.springframework.cloud spring-cloud-starter-netflix-eureka-client org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test
- YML server: port: 9527spring: application: name: cloud-gateway cloud: gateway: routes: - id: payment_routh #路由的ID，没有固定规则但要求唯一，建议配合服务名 uri: http://localhost:8001 #匹配后提供服务的路由地址 predicates: - Path=/payment/get/** #断言,路径相匹配的进行路由 - id: payment_routh2 uri: http://localhost:8001 predicates: - Path=/payment/lb/** #断言,路径相匹配的进行路由eureka: instance: hostname: cloud-gateway-service client: service-url: register-with-eureka: true fetch-registry: true defaultZone: http://eureka7001.com:7001/eureka
- 业务类
  - 无
- 主启动类 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication@EnableEurekaClientpublic class GateWayMain9527 { public static void main(String[] args) { SpringApplication.run( GateWayMain9527.class,args); }}
- 9527网关如何做路由映射那？？？
  - cloud-provider-payment8001看看controller的访问地址
    - get
    - lb
  - 我们目前不想暴露8001端口，希望在8001外面套一层9527
- YML新增网关配置 server: port: 9527spring: application: name: cloud-gateway cloud: gateway: routes: - id: payment_routh #路由的ID，没有固定规则但要求唯一，建议配合服务名 uri: http://localhost:8001 #匹配后提供服务的路由地址 predicates: - Path=/payment/get/** #断言,路径相匹配的进行路由 - id: payment_routh2 uri: http://localhost:8001 predicates: - Path=/payment/lb/** #断言,路径相匹配的进行路由eureka: instance: hostname: cloud-gateway-service client: service-url: register-with-eureka: true fetch-registry: true defaultZone: http://eureka7001.com:7001/eureka
- 测试
  - 启动7001
  - 启动8001
    - cloud-provider-payment8001
  - 启动9527网关
  - 访问说明
    - 添加网关前
      - http://localhost:8001/payment/get/31
    - 添加网关后
      - http://localhost:9527/payment/get/31
- YML配置说明
  - Gateway网关路由有两种配置方式
    - 在配置文件yml中配置
      - 见前面步骤
    - 代码中注入RouteLocator的Bean
      - 官网案例
      - 百度国内新闻网址，需要外网
      - http://news.baidu.com/guoji
      - 自己写一个
      - 百度新闻
      - 业务需求
      - 通过9527网关访问到外网的百度新闻网址
      - 编码
      - cloud-gateway-gateway9527
      - 实现业务
      - config package com.atguigu.springcloud.config;import org.springframework.cloud.gateway.route.RouteLocator;import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class GateWayConfig { @Bean public RouteLocator customRouteLocator(RouteLocatorBuilder routeLocatorBuilder) { RouteLocatorBuilder.Builder routes = routeLocatorBuilder.routes(); routes.route("path_rote_atguigu", r -> r.path("/guonei").uri("http://news.baidu.com/guonei")).build(); return routes.build(); }}

# 通过微服务名实现动态路由

默认情况下Gateway会根据注册中心的服务列表，以注册中心上微服务名为路径创建动态路由进行转发，从而实现动态路由的功能
启动
- 一个eureka7001 两个服务提供者8001/8002
POM
YML server: port: 9527spring: application: name: cloud-gateway cloud: gateway: discovery: locator: enabled: true #开启从注册中心动态创建路由的功能，利用微服务名进行路由 routes: - id: payment_routh #路由的ID，没有固定规则但要求唯一，建议配合服务名 #uri: http://localhost:8001 #匹配后提供服务的路由地址 uri: lb://cloud-payment-service predicates: - Path=/payment/get/** #断言,路径相匹配的进行路由 - id: payment_routh2 #uri: http://localhost:8001 #匹配后提供服务的路由地址 uri: lb://cloud-payment-service predicates: - Path=/payment/lb/** #断言,路径相匹配的进行路由eureka: instance: hostname: cloud-gateway-service client: service-url: register-with-eureka: true fetch-registry: true defaultZone: http://eureka7001.com:7001/eureka
- 需要注意的是uri的协议为lb，表示启用Gateway的负载均衡功能。
- lb://serviceName是spring cloud gateway在微服务中自动为我们创建的负载均衡uri
测试
- http://localhost:9527/payment/lb
  - 8001/8002两个端口切换

# Predicate的使用

是什么
- 启动我们的gatewat9527
Route Predicate Factories这个是什么东东？
常用的Route Predicate
- 1.After Route Predicate ZonedDateTime zonedDateTime = ZonedDateTime.now(); System.out.println(zonedDateTime);
  - YML
    - After=2020-03-08T10:59:34.102 08:00[Asia/Shanghai]
- 2.Before Route Predicate
  - YML
    - After=2020-03-08T10:59:34.102 08:00[Asia/Shanghai] - Before=2020-03-08T10:59:34.102 08:00[Asia/Shanghai]
- 3.Between Route Predicate
  - YML
    - Between=2020-03-08T10:59:34.102 08:00[Asia/Shanghai] , 2020-03-08T10:59:34.102 08:00[Asia/Shanghai]
- 1. Cookie Route Predicate
  - 不带cookies访问
  - 带上cookies访问
    - 加入curl返回中文乱码 https://blog.csdn.net/leedee/article/details/82685636
  - YML
    - Cookie=username,atguigu #并且Cookie是username=zhangshuai才能访问
- 1. Header Route Predicate
  - YML
    - Header=X-Request-Id, d #请求头中要有X-Request-Id属性并且值为整数的正则表达式
- 6.Host Route Predicate
  - YML
    - Host=**.atguigu.com
- 7.Method Route Predicate
  - YML
    - Method=GET
- 8.Path Route Predicate
  - YML
- 1. Query Route Predicate
  - YML
    - Query=username, d #要有参数名称并且是正整数才能路由
- 10.小总结
  - All server: port: 9527spring: application: name: cloud-gateway cloud: gateway: discovery: locator: enabled: true #开启从注册中心动态创建路由的功能，利用微服务名进行路由 routes: - id: payment_routh #路由的ID，没有固定规则但要求唯一，建议配合服务名 #uri: http://localhost:8001 #匹配后提供服务的路由地址 uri: lb://cloud-payment-service predicates: - Path=/payment/get/** #断言,路径相匹配的进行路由 - id: payment_routh2 #uri: http://localhost:8001 #匹配后提供服务的路由地址 uri: lb://cloud-payment-service predicates: - Path=/payment/lb/** #断言,路径相匹配的进行路由 #- After=2020-03-08T10:59:34.102 08:00[Asia/Shanghai] #- Cookie=username,zhangshuai #并且Cookie是username=zhangshuai才能访问 #- Header=X-Request-Id, d #请求头中要有X-Request-Id属性并且值为整数的正则表达式 #- Host=**.atguigu.com #- Method=GET #- Query=username, d #要有参数名称并且是正整数才能路由eureka: instance: hostname: cloud-gateway-service client: service-url: register-with-eureka: true fetch-registry: true defaultZone: http://eureka7001.com:7001/eureka
  - 说白了，Predicate就是为了实现一组匹配规则，让请求过来找到对应的Route进行处理

# Filter的使用

是什么
Spring Cloud Gateway的Filter
- 生命周期，Only Two
  - pre
    - 在业务逻辑之前
  - post
    - 在业务逻辑之后
- 种类，Only Two
  - GatewayFilter
    - 单一
  - GlobalFilter
    - 全局
常用的GatewayFilter
- AddRequestParameter
  - YML
- 省略
自定义过滤器
- 自定义全局GlobalFilter
  - 两个主要接口介绍
    - impiemerts GlobalFilter ，Ordered
  - 能干嘛
    - 全局日志记录
    - 统一网关鉴权
    - 。。。。。。
  - 案例代码 package com.atguigu.springcloud.filter;import lombok.extern.slf4j.Slf4j;import org.springframework.cloud.gateway.filter.GatewayFilterChain;import org.springframework.cloud.gateway.filter.GlobalFilter;import org.springframework.core.Ordered;import org.springframework.http.HttpStatus;import org.springframework.stereotype.Component;import org.springframework.util.StringUtils;import org.springframework.web.server.ServerWebExchange;import reactor.core.publisher.Mono;import java.util.Date;@Component@Slf4jpublic class MyLogGateWayFilter implements GlobalFilter,Ordered { @Override public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) { log.info("*********come in MyLogGateWayFilter: " new Date()); String uname = exchange.getRequest().getQueryParams().getFirst("username"); if(StringUtils.isEmpty(username)){ log.info("*****用户名为Null 非法用户,(┬＿┬)"); exchange.getResponse().setStatusCode(HttpStatus.NOT_ACCEPTABLE);//给人家一个回应 return exchange.getResponse().setComplete(); } return chain.filter(exchange); } @Override public int getOrder() { return 0; }}
  - 测试
    - 启动
    - 正确
      - http://localhost:9527/payment/lb?uname=z3
    - 错误

# 13.SpringCloud config分布式配置中心

# 概述

分布式系统面临的配置问题
是什么
能干嘛
- 集中管理配置文件
- 不同环境不同配置，动态化的配置更新，分环境部署比如dev/test/prod/beta/release
- 运行期间动态调整配置，不再需要在每个服务部署的机器上编写配置文件，服务会向配置中心统一拉取配置自己的信息
- 当配置发生变动时，服务不需要重启即可感知到配置的变化并应用新的配置
- 将配置信息以REST接口的形式暴露
  - post、curl访问刷新均可....
与Github整合配置
- 由于SpringCloud Config默认使用Git来存储配置文件（也有其它方式，比如支持svn和本地文件，但最推荐的还是Git，而且使用的是http/https访问的形式）
官网
- https://cloud.spring.io/spring-cloud-static/spring-cloud-config/2.2.1.RELEASE/reference/html/

# Config服务端配置与测试

用你自己的账号在Github上新建一个名为sprincloud-config的新Repository
由上一步获得刚新建的git地址
- 写你自己的仓库地址
本地硬盘上新建git仓库并clone
- 本地地址：D:44SpringCloud2020
- git命令
  - git clone xxx
此时在本地D盘符下D:44SpringCloud2020springcloud-config
- 表示多个环境的配置文件
- 保存格式必须为UTF-8
- 如果需要修改，此处模拟运维人员操作git和github
  - git add
  - git commit -m "init yml"
  - git push origin master
新建Module模块cloud-config-center-3344它既为Cloud的配置中心模块cloudConfig Center
POM <?xml version="1.0" encoding="UTF-8"?>cloud2020 com.atguigu.springcloud 1.0-SNAPSHOT 4.0.0 cloud-config-center-3344 org.springframework.cloud spring-cloud-config-server org.springframework.cloud spring-cloud-starter-netflix-eureka-client com.atguigu.springcloud cloud-api-commons ${project.version} org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test
YML server: port: 3344spring: application: name: cloud-config-center cloud: config: server: git: uri: 填写你自己的github路径 search-paths: - springcloud-config label: mastereureka: client: service-url: defaultZone: http://localhost:7001/eureka
主启动类
- ConfigCenterMain3344 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.config.server.EnableConfigServer;@SpringBootApplication@EnableConfigServerpublic class ConfigCenterMain3344 { public static void main(String[] args) { SpringApplication.run(ConfigCenterMain3344 .class,args); }}
  - @EnableConfigServer
windows下修改hosts文件，增加映射
- 127.0.0.1 config-3344.com
测试通过Config微服务是否可以从Github上获取配置内容
- 启动微服务3344
- http://config-3344.com:3344/master/config-dev.yml
配置读取规则
- 官网
- /{label}/{application}-{profile}.yml（最推荐使用这种方式）
  - master分支
    - http://config-3344.com:3344/master/config-dev.yml
    - http://config-3344.com:3344/master/config-test.yml
    - http://config-3344.com:3344/master/config-prod.yml
  - dev分支
    - http://config-3344.com:3344/dev/config-dev.yml
    - http://config-3344.com:3344/dev/config-test.yml
    - http://config-3344.com:3344/dev/config-prod.yml
- /{application}-{profile}.yml
  - http://config-3344.com:3344/config-dev.yml
  - http://config-3344.com:3344/config-test.yml
  - http://config-3344.com:3344/config-prod.yml
  - http://config-3344.com:3344/config-xxxx.yml(不存在的配置)
- /{application}-{profile}[/{label}]
  - http://config-3344.com:3344/config/dev/master
  - http://config-3344.com:3344/config/test/master
  - http://config-3344.com:3344/config/prod/master
- 重要配置细节总结
成功实现了用SpringCloud Config 通过GitHub获取配置信息

# Config客户端配置与测试

新建cloud-config-client-3355
POM <?xml version="1.0" encoding="UTF-8"?>cloud2020 com.atguigu.springcloud 1.0-SNAPSHOT 4.0.0 cloud-config-client-3355 org.springframework.cloud spring-cloud-starter-config org.springframework.cloud spring-cloud-starter-netflix-eureka-client com.atguigu.springcloud cloud-api-commons ${project.version} org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test
bootstap.yml
- 是什么
- 内容 server: port: 3355spring: application: name: config-client cloud: config: label: master name: config profile: dev uri: http://localhost:3344eureka: client: service-url: defaultZone: http://eureka7001.com:7001/eureka
  - 说明
修改config-dev.yml配置并提交到GitHub中，比如加个变量age或者版本号version
主启动 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class ConfigClientMain3355 { public static void main(String[] args) { SpringApplication.run( ConfigClientMain3355.class,args); }}
- 类ConfigClientMain3355
业务类 package com.atguigu.springcloud.Controller;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class ConfigClientController { @Value("${config.info}") private String configInfo; @GetMapping("/configInfo") public String getConfigInfo(){ return configInfo; }}
测试
- 启动Config配置中心3344微服务并自测
  - http://config-3344.com:3344/master/config-dev.yml
  - http://config-3344.com:3344/master/config-test.yml
- 启动3355作为Client准备访问
  - http://localhost:3355/configInfo
成功实现了客户端3355访问SpringCloud Config3344通过GitHub获取配置信息
问题随时而来，分布式配置的动态刷新
- Linux运维修改GitHub上的配置文件内容做调整
- 刷新3344，发现ConfigServer配置中心立刻响应
- 刷新3355，发现ConfigServer客户端没有任何响应
- 3355没有变化除非自己重启或者重新加载
- 难道每次运维修改配置文件，客户端都需要重启？？噩梦

# Config客户端之动态刷新

避免每次更新配置都要重启客户端微服务3355
动态刷新
- 步骤
  - 修改3355模块
  - POM引入actuator监控 org.springframework.boot spring-boot-starter-actuator
  - 修改YML，暴露监控端口 server: port: 3355spring: application: name: config-client cloud: config: label: master name: config profile: dev uri: http://localhost:3344eureka: client: service-url: defaultZone: http://eureka7001.com:7001/eurekamanagement: endpoints: web: exposure: include: "*"
  - @RefreshScope业务类Controller修改 package com.atguigu.springcloud.Controller;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.context.config.annotation.RefreshScope;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RefreshScope@RestControllerpublic class ConfigClientController { @Value("${config.info}") private String configInfo; @GetMapping("/configInfo") public String getConfigInfo(){ return configInfo; }}
  - 此时修改github---> 3344 ---> 3355
    - http://localhost:3355/configInfo
    - 3355改变了没有？？？
      - 没有改变，(┬＿┬)
  - How
    - 需要运维人员发送Post请求刷新3355
      - 必须是Post请求
      - curl -X POST "http://localhost:3355/actuator/refresh"
  - 再次
    - http://localhost:3355/configInfo
      - OK
    - 成功实现了客户端3355刷新到最新配置内容
      - 避免了服务的重启
想想还有什么问题？
- 假如有多个微服务客户端3355/3366/3377。。。。
- 每个微服务都要执行一次post请求，手动刷新？
- 可否广播，一次通知，处处生效？
- 我们想大范围的自动刷新，求方法

# 14.SpringCloud Bus 消息总线

# 概述

上一讲解的加深和扩充，一言以蔽之
- 分布式自动刷新配置功能
- Spring Cloud Bus配合Spring Cloud Config使用可以实现配置的动态刷新
是什么
- Bus支持两种消息代理：RabbitMQ和Kafka
能干嘛
为何被称为总线

# RabbitMQ环境配置

安装Erlang，下载地址：
- http://erlang.org/download/otp_win64_21.3.exe
- 步骤
安装RabbitMQ，下载地址
- https://dl.bintray.com/rabbitmq/all/rabbitmq-server/3.7.14/rabbitmq-server-3.7.14.exe
- 步骤
进入RabbitMQ安装目录下的sbin目录
- 如例我自己本机
  - D:scmqrabbitmq_server-3.7.14sbin
输入以下命令启动管理功能
- rabbitmq-plugins enable rabbitmq_management
- 可视化插件
访问地址查看是否安装成功
- http://localhost:15672/
输入账号密码并登录: guest guest

# SpringCloud Bus动态刷新全局广播

必须先具备良好的RabbitMQ环境先
演示广播效果，增加复杂度，再以3355为模板再制作一个3366 新建 cloud-config-client-3366 POM org.springframework.cloud spring-cloud-starter-config org.springframework.cloud spring-cloud-starter-netflix-eureka-client com.atguigu.springcloud cloud-api-commons {project.version} org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test YML server: port: 3366spring: application: name: config-client cloud: config: label: master name: config profile: dev uri: http://localhost:3344eureka: client: service-url: defaultZone: http://eureka7001.com:7001/eurekamanagement: endpoints: web: exposure: include: "*" 主启动 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@EnableEurekaClient@SpringBootApplicationpublic class ConfigClientMain3366 { public static void main(String[] args) { SpringApplication.run( ConfigClientMain3366.class,args); }} controller package com.atguigu.springcloud.controller;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.context.config.annotation.RefreshScope;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RefreshScopepublic class ConfigClientController { @Value("
设计思想
- 1. 利用消息总线触发一个客户端/bus/refresh,而刷新所有客户端的配置
- 1. 利用消息总线触发一个服务端ConfigServer的/bus/refresh端点,而刷新所有客户端的配置（更加推荐）
- 图二的架构显然更加合适，图一不适合的原因如下
  - 打破了微服务的职责单一性，因为微服务本身是业务模块，它本不应该承担配置刷新职责
  - 破坏了微服务各节点的对等性
  - 有一定的局限性。例如，微服务在迁移时，它的网络地址常常会发生变化，此时如果想要做到自动刷新，那就会增加更多的修改
给cloud-config-center-3344配置中心服务端添加消息总线支持
- POM org.springframework.cloud spring-cloud-starter-bus-amqp
- YML server: port: 3344spring: application: name: cloud-config-center cloud: config: server: git: uri: https://github.com/hhf19906/springcloud-config.git #git@github.com:hhf19906/springcloud-config.git search-paths: - springcloud-config label: masterrabbitmq: host: localhost port: 5672 username: guest password: guesteureka: client: service-url: defaultZone: http://localhost:7001/eurekamanagement: endpoints: web: exposure: include: 'bus-refresh'
给cloud-config-center-3355客户端添加消息总线支持
- POM org.springframework.cloud spring-cloud-starter-bus-amqp
- YML server: port: 3355spring: application: name: config-client cloud: config: label: master name: config profile: dev uri: http://localhost:3344rabbitmq: host: localhost port: 5672 username: guest password: guesteureka: client: service-url: defaultZone: http://eureka7001.com:7001/eurekamanagement: endpoints: web: exposure: include: "*"
给cloud-config-center-3366客户端添加消息总线支持
- POM org.springframework.cloud spring-cloud-starter-bus-amqp
- YML server: port: 3366spring: application: name: config-client cloud: config: label: master name: config profile: dev uri: http://localhost:3344 rabbitmq: host: localhost port: 5672 username: guest password: guesteureka: client: service-url: defaultZone: http://localhost:7001/eurekamanagement: endpoints: web: exposure: include: '*'
测试
- 运维工程师
  - 修改Github上配置文件增加版本号
  - 发送Post请求
    - Subtopic
    - curl -X POST "http://localhost:3344/actuator/bus-refresh"
    - 一次发送，处处生效
- 配置中心
  - http://config-3344.com/config-dev.yml
- 客户端
  - http://localhost:3355/configInfo
  - http://localhost:3366/configInfo
  - 获取配置信息，发现都已经刷新了
一次修改，广播通知，处处生效

# SpringCloud Bus动态刷新定点通知

不想全部通知，只想定点通知
- 只通知3355
- 不通知3366
简单一句话
- 指定具体某一个实例生效而不是全部
- 公式：http://localhost:配置中心的端口号/actuator/bus-refresh/{destination}
- /bus/refresh请求不再发送到具体的服务实例上，而是发给config server并通过destination参数类指定需要更新配置的服务或实例
案例
- 我们这里以刷新运行在3355端口上的config-client为例
  - 只通知3355
  - 不通知3366
- curl -X POST "http://localhost:3344/actuator/bus-refresh/config-client:3355"
通知总结All

# 15.SpringCloud Stream消息驱动

# 消息驱动概述

是什么
- 一句话
  - 屏蔽底层消息中间件的差异，降低切换版本，统一消息的编程模型
- 官网
  - https://spring.io/projects/spring-cloud-stream#overview
  - https://cloud.spring.io/spring-cloud-static/spring-cloud-stream/3.0.1.RELEASE/reference/html/
  - Spring Cloud Stream中文指导手册
    - https://m.wang1314.com/doc/webapp/topic/20971999.html
设计思想
- 标准MQ
  - 生产者/消费者之间靠消息媒介传递信息内容
    - Message
  - 消息必须走特定的通道
    - 消息通道MessageChannel
  - 消息通道里的消息如何被消费呢，谁负责收发处理
    - 消息通道MessageChannel的子接口SubscribableChannel,由MessageHandler消息处理器订阅
- 为什么用Cloud Stream
  - stream凭什么可以统一底层差异
  - Binder
    - INPUT对应于消费者
    - OUTPUT对应于生产者
- Stream中的消息通信方式遵循了发布-订阅模式
  - Topic主题进行广播
    - 在RabbitMQ就是Exchange
    - 在kafka中就是Topic
Spring Cloud Stream标准流程套路
- Binder
  - 很方便的连接中间件，屏蔽差异
- Channel
  - 通道，是队列Queue的一种抽象，在消息通讯系统中就是实现存储和转发的媒介，通过对Channel对队列进行配置
- Source和Sink
  - 简单的可理解为参照对象是Spring Cloud Stream自身，从Stream发布消息就是输出，接受消息就是输入
编码API和常用注解

# 案例说明

RabbitMQ环境已经OK
工程中新建三个子模块
- cloud-stream-rabbitmq-provider8801,作为生产者进行发消息模块
- cloud-stream-rabbitmq-consumer8802,作为消息接收模块
- cloud-stream-rabbitmq-consumer8803,作为消息接收模块

# 消息驱动之生产者

新建Module
- cloud-stream-rabbitmq-provider8801
POM <?xml version="1.0" encoding="UTF-8"?>cloud2020 com.atguigu.springcloud 1.0-SNAPSHOT 4.0.0 cloud-stream-rabbitmq-provider8801 org.springframework.cloud spring-cloud-starter-stream-rabbit org.springframework.cloud spring-cloud-starter-netflix-eureka-client com.atguigu.springcloud cloud-api-commons ${project.version} org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test
YML server: port: 8801spring: application: name: cloud-stream-provider cloud: stream: binders: # 在此处配置要绑定的rabbitmq的服务信息； defaultRabbit: # 表示定义的名称，用于于binding整合 type: rabbit # 消息组件类型 environment: # 设置rabbitmq的相关的环境配置 spring: rabbitmq: host: localhost port: 5672 username: guest password: guest bindings: # 服务的整合处理 output: # 这个名字是一个通道的名称 destination: studyExchange # 表示要使用的Exchange名称定义 content-type: application/json # 设置消息类型，本次为json，文本则设置“text/plain” binder: defaultRabbit # 设置要绑定的消息服务的具体设置eureka: client: # 客户端进行Eureka注册的配置 service-url: defaultZone: http://localhost:7001/eureka instance: lease-renewal-interval-in-seconds: 2 # 设置心跳的时间间隔（默认是30秒） lease-expiration-duration-in-seconds: 5 # 如果现在超过了5秒的间隔（默认是90秒） instance-id: send-8801.com # 在信息列表时显示主机名称 prefer-ip-address: true # 访问的路径变为IP地址
主启动类StreamMQMain8801 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class StreamMQMain8801 { public static void main(String[] args) { SpringApplication.run(StreamMQMain8801.class, args); }}
业务类
- 发送消息接口 package com.atguigu.springcloud.service;public interface IMessageProvider{ public String send();}
- 发送消息接口实现类 package com.atguigu.springcloud.service.impl;import com.atguigu.springcloud.service.IMessageProvider;import org.springframework.cloud.stream.annotation.EnableBinding;import org.springframework.integration.support.MessageBuilderFactory;import org.springframework.messaging.MessageChannel;import org.springframework.integration.support.MessageBuilder;import javax.annotation.Resource;import org.springframework.cloud.stream.messaging.Source;import javax.annotation.Resource;import java.util.UUID;@EnableBinding(Source.class) //定义消息的推送管道public class MessageProviderImpl implements IMessageProvider{ @Resource private MessageChannel output; // 消息发送管道 @Override public String send() { String serial = UUID.randomUUID().toString(); output.send(MessageBuilder.withPayload(serial).build()); System.out.println("*****serial: " serial); return null; }}
- Controller package com.atguigu.springcloud.controller;import com.atguigu.springcloud.service.IMessageProvider;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;@RestControllerpublic class SendMessageController{ @Resource private IMessageProvider messageProvider; @GetMapping(value = "/sendMessage") public String sendMessage() { return messageProvider.send(); }}
测试
- 启动7001eureka
- 启动rabbitmq
  - rabbitmq-plugins enable rabbitmq_management
  - http://localhost:15672/
- 启动8801
- 访问
  - http://localhost:8801/sendMessage

# 消息驱动之消费者

新建Module
- cloud-stream-rabbitmq-consumer8802
POM <?xml version="1.0" encoding="UTF-8"?>cloud2020 com.atguigu.springcloud 1.0-SNAPSHOT 4.0.0 cloud-stream-rabbitmq-consumer8802 org.springframework.cloud spring-cloud-starter-stream-rabbit org.springframework.cloud spring-cloud-starter-netflix-eureka-client com.atguigu.springcloud cloud-api-commons ${project.version} org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test
YML server: port: 8802spring: application: name: cloud-stream-consumer cloud: stream: binders: # 在此处配置要绑定的rabbitmq的服务信息； defaultRabbit: # 表示定义的名称，用于于binding整合 type: rabbit # 消息组件类型 environment: # 设置rabbitmq的相关的环境配置 spring: rabbitmq: host: localhost port: 5672 username: guest password: guest bindings: # 服务的整合处理 input: # 这个名字是一个通道的名称 destination: studyExchange # 表示要使用的Exchange名称定义 content-type: application/json # 设置消息类型，本次为json，文本则设置“text/plain” binder: defaultRabbit # 设置要绑定的消息服务的具体设置eureka: client: # 客户端进行Eureka注册的配置 service-url: defaultZone: http://localhost:7001/eureka instance: lease-renewal-interval-in-seconds: 2 # 设置心跳的时间间隔（默认是30秒） lease-expiration-duration-in-seconds: 5 # 如果现在超过了5秒的间隔（默认是90秒） instance-id: receive-8802.com # 在信息列表时显示主机名称 prefer-ip-address: true # 访问的路径变为IP地址
主启动类StreamMQMain8802 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class StreamMQMain8802 { public static void main(String[] args) { SpringApplication.run(StreamMQMain8802.class, args); }}
业务类 package com.atguigu.springcloud.controller;import org.springframework.cloud.stream.annotation.StreamListener;import org.springframework.messaging.Message;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.stream.annotation.EnableBinding;import org.springframework.cloud.stream.messaging.Sink;import org.springframework.stereotype.Component;@Component@EnableBinding(Sink.class)public class ReceiveMessageListenerController { @Value("${server.port}") private String serverPort; @StreamListener(Sink.INPUT) public void input(Message<String> message) { System.out.println("消费者1号，接受：" message.getPayload() "t port:" serverPort); }}
测试8801发送8802接收消息
- http://localhost:8801/sendMessage

# 分组消费与持久化

依照8802，clone出来一份运行8803
- cloud-stream-rabbitmq-consumer8803
  - POM <?xml version="1.0" encoding="UTF-8"?>cloud2020 com.atguigu.springcloud 1.0-SNAPSHOT 4.0.0 cloud-stream-rabbitmq-consumer8803 org.springframework.boot spring-boot-starter-web org.springframework.cloud spring-cloud-starter-netflix-eureka-client org.springframework.cloud spring-cloud-starter-stream-rabbit org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test
  - YML server: port: 8803spring: application: name: cloud-stream-consumer cloud: stream: binders: # 在此处配置要绑定的rabbitmq的服务信息； defaultRabbit: # 表示定义的名称，用于于binding整合 type: rabbit # 消息组件类型 environment: # 设置rabbitmq的相关的环境配置 spring: rabbitmq: host: localhost port: 5672 username: guest password: guest bindings: # 服务的整合处理 input: # 这个名字是一个通道的名称 destination: studyExchange # 表示要使用的Exchange名称定义 content-type: application/json # 设置消息类型，本次为对象json，如果是文本则设置“text/plain” binder: defaultRabbit # 设置要绑定的消息服务的具体设置 group: atguiguAeureka: client: # 客户端进行Eureka注册的配置 service-url: defaultZone: http://localhost:7001/eureka instance: lease-renewal-interval-in-seconds: 2 # 设置心跳的时间间隔（默认是30秒） lease-expiration-duration-in-seconds: 5 # 如果现在超过了5秒的间隔（默认是90秒） instance-id: receive-8803.com # 在信息列表时显示主机名称 prefer-ip-address: true # 访问的路径变为IP地址
  - 主启动类 package com.atguigu.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class StreamMQMain8803{ public static void main(String[] args) { SpringApplication.run(StreamMQMain8803.class,args); }}
  - 业务类 package com.atguigu.springcloud.controller;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.stream.annotation.EnableBinding;import org.springframework.cloud.stream.annotation.StreamListener;import org.springframework.cloud.stream.messaging.Sink;import org.springframework.messaging.Message;import org.springframework.stereotype.Component;@Component@EnableBinding(Sink.class)public class ReceiveMessageListenerController{ @Value("${server.port}") private String serverPort; @StreamListener(Sink.INPUT) public void input(Message<String> message) { System.out.println("消费者2号,----->接受到的消息: " message.getPayload() "t port: " serverPort); }}
启动
- RabbitMQ
- 7001
  - 服务注册
- 8801
  - 消息生产
- 8802
  - 消息消费
- 8803
  - 消息消费
运行后两个问题
- 有重复消费问题
- 消息持久化问题
消费
- 目前是8802/8803同时都收到了，存在重复消费问题
  - http://localhost:8801/sendMessage
  - 如何解决
    - 分组和持久化属性group
      - 重要
  - 生产实际案例
分组
- 原理
  - 微服务应用放置于同一个group中，就能够保证消息只会被其中一个应用消费一次。不同的组是可以消费的，同一个组内会发生竞争关系，只有其中一个可以消费。
- 8802/8803都变成不同组，group两个不同
  - group: atguiguA、atguiguB
  - 8802修改YML group: atguiguA
  - 8803修改YML group: atguiguB
  - 我们自己配置
  - 结论
    - 还是重复消费
- 8802/8803实现了轮询分组，每次只有一个消费者 8801模块的发的消息只能被8802或8803其中一个接收到，这样避免了重复消费
- 8802/8803都变成相同组，group两个相同
  - group: atguiguA
  - 8802修改YML group: atguiguA
  - 8803修改YML group: atguiguA
  - 结论
    - 同一个组的多个微服务实例，每次只会有一个拿到
持久化
- 通过上述，解决了重复消费问题，再看看持久化
- 停止8802/8803并去除掉8802的分组group:atguiguA
  - 8803的分组group:atguiguA没有去掉
- 8801先发送4条信息到rabbitmq
- 先启动8802，无分组属性配置，后台没有打出来消息
- 先启动8803，有分组属性配置，后台打出来了MQ上的消息

# 16.SpringCloud Sleuth分布式请求链路追踪

# 概述

为什么会出现这个技术？需要解决哪些问题？
- 问题
是什么
- https://github.com/spring-cloud/spring-cloud-sleuth
- Spring Cloud Sleuth提供了一套完整的服务跟踪的解决方案
- 在分布式系统中提供追踪解决方案并且兼容支持了zipkin
解决

# 搭建链路监控步骤

1.zipkin
- 下载
  - SpringCloud从F版起已不需要自己构建Zipkin server了，只需要调用jar包即可
  - https://dl.bintray.com/openzipkin/maven/io/zipkin/java/zipkin-server/
  - zipkin-server-2.12.9.exec.jar
- 运行jar java -jar zipkin-server-2.12.9-exec.jar
- 运行控制台
  - http://localhost:9411/zipkin/
  - 术语
    - 完整的调用链路
    - 上图what
    - 名词解释
      - Trace:类似于树结构的Span集合，表示一条调用链路，存在唯一标识
      - span:表示调用链路来源，通俗的理解span就是一次请求信息
2.服务提供者
- cloud-provider-payment8001
- POM org.springframework.cloud spring-cloud-starter-zipkin
- YML server: port: 8001spring: application: name: cloud-payment-service zipkin: base-url: http://localhost:9411 sleuth: sampler: probability: 1 datasource: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: org.gjt.mm.mysql.Driver url: username: root password: mybatis: mapperLocations: classpath:mapper/*.xml type-aliases-package: com.atguigu.springcloud.entitieseureka: client: register-with-eureka: true fetchRegistry: true service-url: defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka #集群版 instance: instance-id: payment8001 prefer-ip-address: true
- 业务类PaymentController package com.atguigu.springcloud.controller;import com.atguigu.springcloud.entities.CommonResult;import com.atguigu.springcloud.entities.Payment;import com.atguigu.springcloud.service.PaymentService;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.client.ServiceInstance;import org.springframework.web.bind.annotation.*;import org.springframework.cloud.client.discovery.DiscoveryClient;import javax.annotation.Resource;import java.util.List;import java.util.concurrent.TimeUnit;@RestController@Slf4jpublic class PaymentController{ @Resource private PaymentService paymentService; @Value("${server.port}") private String serverPort; @Resource private DiscoveryClient discoveryClient; @PostMapping(value = "/payment/create") public CommonResult create(@RequestBody Payment payment) { int result = paymentService.create(payment); log.info("*****插入结果：" result); if(result > 0) { return new CommonResult(200,"插入数据库成功,serverPort: " serverPort,result); }else{ return new CommonResult(444,"插入数据库失败",null); } } @GetMapping(value = "/payment/get/{id}") public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) { Payment payment = paymentService.getPaymentById(id); if(payment != null) { return new CommonResult(200,"查询成功,serverPort: " serverPort,payment); }else{ return new CommonResult(444,"没有对应记录,查询ID: " id,null); } } @GetMapping(value = "/payment/discovery") public Object discovery() { List<String> services = discoveryClient.getServices(); for (String element : services) { log.info("*****element: " element); } List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE"); for (ServiceInstance instance : instances) { log.info(instance.getServiceId() "t" instance.getHost() "t" instance.getPort() "t" instance.getUri()); } return this.discoveryClient; } @GetMapping(value = "/payment/lb") public String getPaymentLB() { return serverPort; } @GetMapping(value = "/payment/feign/timeout") public String paymentFeignTimeout() { // 业务逻辑处理正确，但是需要耗费3秒钟 try { TimeUnit.SECONDS.sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } return serverPort; } @GetMapping("/payment/zipkin") public String paymentZipkin() { return "hi ,i'am paymentzipkin server fall back，welcome to atguigu，O(∩_∩)O哈哈~"; }}
3.服务消费者（调用方） org.springframework.cloud spring-cloud-starter-zipkin
- cloud-consumer-order80
- POM org.springframework.cloud spring-cloud-starter-zipkin
- YML server: port: 80spring: application: name: cloud-order-service zipkin: base-url: http://localhost:9411 sleuth: sampler: probability: 1eureka: client: #表示是否将自己注册进EurekaServer默认为true。 register-with-eureka: false #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡 fetchRegistry: true service-url: #单机 #defaultZone: http://localhost:7001/eureka # 集群 defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版
- 业务类OrderController // ====================> zipkin sleuth @GetMapping("/consumer/payment/zipkin") public String paymentZipkin() { String result = restTemplate.getForObject("http://localhost:8001" "/payment/zipkin/", String.class); return result; }
4.依次启动eureka7001/8001/80
- 80调用8001几次测试下
5.打开浏览器访问:http:localhost:9411
- 会出现以下界面
  - 查看
- 查看依赖关系
- 原理

# 17.SpringCloud Alibaba入门简介

# why会出现SpringCloud alibaba

Spring Cloud Netflix项目进入维护模式
- https://spring.io/blog/2018/12/12/spring-cloud-greenwich-rc1-available-now
  - 说明
SpringCloud NetFlix Projects Entering Maintenance Mode
- 什么是维护模式
- 进入维护模式意味着什么呢？

# SpringCloud alibaba带来了什么？

是什么 https://github.com/alibaba/spring-cloud-alibaba/blob/master/README-zh.md
能干嘛
去哪下
- https://github.com/alibaba/spring-cloud-alibaba/blob/master/README-zh.md
怎么玩 Sentinel：把流量作为切入点，从流量控制、熔断降级、系统负载保护等多个维度保护服务的稳定性。Nacos：一个更易于构建云原生应用的动态服务发现、配置管理和服务管理平台。RocketMQ：一款开源的分布式消息系统，基于高可用分布式集群技术，提供低延时的、高可靠的消息发布与订阅服务。Dubbo：Apache Dubbo™ 是一款高性能 Java RPC 框架。Seata：阿里巴巴开源产品，一个易于使用的高性能微服务分布式事务解决方案。Alibaba Cloud ACM：一款在分布式架构环境中对应用配置进行集中管理和推送的应用配置中心产品。Alibaba Cloud OSS: 阿里云对象存储服务（Object Storage Service，简称 OSS），是阿里云提供的海量、安全、低成本、高可靠的云存储服务。您可以在任何应用、任何时间、任何地点存储和访问任意类型的数据。Alibaba Cloud SchedulerX: 阿里中间件团队开发的一款分布式任务调度产品，提供秒级、精准、高可靠、高可用的定时（基于 Cron 表达式）任务调度服务。Alibaba Cloud SMS: 覆盖全球的短信服务，友好、高效、智能的互联化通讯能力，帮助企业迅速搭建客户触达通道。

# SpringCloud alibaba学习资料获取

官网
- https://spring.io/projects/spring-cloud-alibaba#overview
英文
- https://github.com/alibaba/spring-cloud-alibaba
- https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html
中文
- https://github.com/alibaba/spring-cloud-alibaba/blob/master/README-zh.md

# 18.SpringCloud Alibaba Nacos服务注册和配置中心

# Nacos简介

为什么叫Nacos
- 前四个字母分别为Naming和Configuration的前两个字母，最后的s为Service
是什么
- 一个更易于构建云原生应用的动态服务发现，配置管理和服务管理中心
- Nacos：Dynamic Naming and Configuration Service
- Nacos就是注册中心配置中心的组合
  - 等价于
    - Nacos = Eureka Config Bus
能干嘛
- 替代Eureka做服务注册中心
- 替代Config做服务配置中心
去哪下
- https://github.com/alibaba/Nacos
- 官网文档
  - https://nacos.io/zh-cn/index.html
  - https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_nacos_discovery
各种注册中心比较

# 安装并运行Nacos

本地Java8 Maven环境已经OK
先从官网下载Nacos
- https://github.com/alibaba/nacos/releases/tag/1.1.4
解压安装包，直接运行bin目录下的startup.cmd
命令运行成功后直接访问http://localhost:8848/nacos
- 默认账号密码都是nacos
结果页面

# Nacos作为服务注册中心演示

官网文档
基于Nacos的服务提供者
- 新建Module
  - cloudalibaba-provider-payment9001
- POM
  - 父POM com.alibaba.cloud spring-cloud-alibaba-dependencies 2.1.0.RELEASE pom import
  - 本模块POM com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test testcom.alibaba fastjson 1.2.62
- YML server: port: 9001spring: application: name: nacos-payment-provider cloud: nacos: discovery: server-addr: localhost:8848 #配置Nacos地址management: endpoints: web: exposure: include: '*'
- 主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@EnableDiscoveryClient@SpringBootApplicationpublic class PaymentMain9001 { public static void main(String[] args) { SpringApplication.run(PaymentMain9001.class,args); }}
- 业务类 package com.atguigu.springcloud.alibaba.controller;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class PaymentController{ @Value("${server.port}") private String serverPort; @GetMapping(value = "/payment/nacos/{id}") public String getPayment(@PathVariable("id") Integer id) { return "nacos registry, serverPort: " serverPort "t id" id; }}
- 测试
  - http://lcoalhost:9001/payment/nacos/1
  - nacos控制台
  - nacos服务注册中心服务提供者9001都ok了
- 为了下一章节演示nacos的负载均衡，参照9001新建9002
  - 新建cloudalibaba-provider-payment9002
  - 9002其他步骤你懂的
  - 或者取巧不想新建重复体力劳动，直接拷贝虚拟端口映射
基于Nacos的服务消费者新建Module cloudalibaba-consumer-nacos-order83 POM com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery com.atguigu.springcloud cloud-api-commons {project.version} org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test 为什么nacos支持负载均衡 YML server: port: 83spring: application: name: nacos-order-consumer cloud: nacos: discovery: server-addr: localhost:8848service-url: nacos-user-service: http://nacos-payment-provider 主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@EnableDiscoveryClient@SpringBootApplicationpublic class OrderNacosMain83{ public static void main(String[] args) { SpringApplication.run(OrderNacosMain83.class,args); }} 业务类 ApplicationContextBean package com.atguigu.springcloud.alibaba.config;import org.springframework.cloud.client.loadbalancer.LoadBalanced;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.client.RestTemplate;@Configurationpublic class ApplicationContextConfig{ @Bean @LoadBalanced public RestTemplate getRestTemplate() { return new RestTemplate(); }} OrderNacosController package com.atguigu.springcloud.alibaba.controller;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;import javax.annotation.Resource;@RestController@Slf4jpublic class OrderNacosController{ @Resource private RestTemplate restTemplate; @Value("
服务注册中心对比
- 各种注册中心对比
  - Nacos全景图所示
  - Nacos和CAP
  - 切换
    - Nacos支持AP和CP模式的切换 curl -X PUT '$NACOS_SERVER:8848/nacos/v1/ns/operator/switches?entry=serverMode&value=CP'

# Nacos作为服务配置中心演示

Nacos作为配置中心-基础配置 cloudalibaba-config-nacos-client3377 POM com.alibaba.cloud spring-cloud-starter-alibaba-nacos-config com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test YML why配置两个 YML bootstrap server: port: 3377spring: application: name: nacos-config-client cloud: nacos: discovery: server-addr: localhost:8848 #服务注册中心地址 config: server-addr: localhost:8848 #配置中心地址 file-extension: yaml #指定yaml格式的配置 application spring: profiles: active: dev 主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@EnableDiscoveryClient@SpringBootApplicationpublic class NacosConfigClientMain3377{ public static void main(String[] args) { SpringApplication.run(NacosConfigClientMain3377.class, args); }} 业务类 package com.atguigu.springcloud.alibaba.controller;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.context.config.annotation.RefreshScope;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RefreshScopepublic class ConfigClientController{ @Value("{spring.application.name}-{spring.profile.active}.
Nacos作为配置中心-分类配置
- 问题
  - 多环境多项目管理
- Nacos的图形化管理界面
  - 配置管理
  - 命名空间
- Namespace Group Data ID三者关系？为什么这么设计？
- Case
  - DataID方案
    - 指定spring.profile.active和配置文件的DataID来使不同环境下读取不同的配置
    - 默认空间默认分组新建dev和test两个DataID
      - 新建dev配置DataID
      - 新建test配置DataID
    - 通过spring.profile.active属性就能进行多环境下配置文件的读取
    - 测试
      - http://localhost:3377/config/info
      - 配置是什么就加载什么
      - test
  - Group方案
    - 通过Group实现环境区分
      - 新建Group
    - 在nacos图形界面控制台上面新建配置文件DataID
    - bootstrap application
      - 在config下增加一条group的配置即可。可配置为DEV_GROUP或TEST_GROUP
  - Namespace方案
    - 新建dev/test的Namespace
    - 回到服务管理-服务列表查看
    - 按照域名配置填写
    - YML
      - bootstrap namespace:
      - application

# Nacos集群和持久化配置（重要）

官网说明
- https://nacos.io/zh-cn/docs/cluster-mode-quick-start.html
- 官网架构图（写的(┬＿┬)）
- 上图官网翻译，真实情况
- 说明
  - 按照上述，我们需要mysql数据库
  - 官网说明
    - https://nacos.io/zh-cn/docs/deployment.html
    - 重点说明
Nacos持久化配置解释 Nacos默认自带的是嵌入式数据库derby https://github.com/alibaba/nacos/blob/develop/config/pom.xml derby到mysql切换配置步骤 nacos-server-1.1.4nacosconf目录下找到sql脚本 nacos-mysql.sql 执行脚本 CREATE DATABASE nacos_config;USE nacos_config; /* 数据库全名 = nacos_config // 表名称 = config_info //*****************************************/CREATE TABLE config_info ( id bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id', data_id varchar(255) NOT NULL COMMENT 'data_id', group_id varchar(255) DEFAULT NULL, content longtext NOT NULL COMMENT 'content', md5 varchar(32) DEFAULT NULL COMMENT 'md5', gmt_create datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间', gmt_modified datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间', src_user text COMMENT 'source user', src_ip varchar(20) DEFAULT NULL COMMENT 'source ip', app_name varchar(128) DEFAULT NULL, tenant_id varchar(128) DEFAULT '' COMMENT '租户字段', c_desc varchar(256) DEFAULT NULL, c_use varchar(64) DEFAULT NULL, effect varchar(64) DEFAULT NULL, type varchar(64) DEFAULT NULL, c_schema text, PRIMARY KEY (id), UNIQUE KEY uk_configinfo_datagrouptenant (data_id,group_id,tenant_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info'; /*****************************************// 数据库全名 = nacos_config // 表名称 = config_info_aggr //*****************************************/CREATE TABLE config_info_aggr ( id bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id', data_id varchar(255) NOT NULL COMMENT 'data_id', group_id varchar(255) NOT NULL COMMENT 'group_id', datum_id varchar(255) NOT NULL COMMENT 'datum_id', content longtext NOT NULL COMMENT '内容', gmt_modified datetime NOT NULL COMMENT '修改时间', app_name varchar(128) DEFAULT NULL, tenant_id varchar(128) DEFAULT '' COMMENT '租户字段', PRIMARY KEY (id), UNIQUE KEY uk_configinfoaggr_datagrouptenantdatum (data_id,group_id,tenant_id,datum_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='增加租户字段'; /*****************************************// 数据库全名 = nacos_config // 表名称 = config_info_beta //*****************************************/CREATE TABLE config_info_beta ( id bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id', data_id varchar(255) NOT NULL COMMENT 'data_id', group_id varchar(128) NOT NULL COMMENT 'group_id', app_name varchar(128) DEFAULT NULL COMMENT 'app_name', content longtext NOT NULL COMMENT 'content', beta_ips varchar(1024) DEFAULT NULL COMMENT 'betaIps', md5 varchar(32) DEFAULT NULL COMMENT 'md5', gmt_create datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间', gmt_modified datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间', src_user text COMMENT 'source user', src_ip varchar(20) DEFAULT NULL COMMENT 'source ip', tenant_id varchar(128) DEFAULT '' COMMENT '租户字段', PRIMARY KEY (id), UNIQUE KEY uk_configinfobeta_datagrouptenant (data_id,group_id,tenant_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info_beta'; /*****************************************// 数据库全名 = nacos_config // 表名称 = config_info_tag //*****************************************/CREATE TABLE config_info_tag ( id bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id', data_id varchar(255) NOT NULL COMMENT 'data_id', group_id varchar(128) NOT NULL COMMENT 'group_id', tenant_id varchar(128) DEFAULT '' COMMENT 'tenant_id', tag_id varchar(128) NOT NULL COMMENT 'tag_id', app_name varchar(128) DEFAULT NULL COMMENT 'app_name', content longtext NOT NULL COMMENT 'content', md5 varchar(32) DEFAULT NULL COMMENT 'md5', gmt_create datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间', gmt_modified datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间', src_user text COMMENT 'source user', src_ip varchar(20) DEFAULT NULL COMMENT 'source ip', PRIMARY KEY (id), UNIQUE KEY uk_configinfotag_datagrouptenanttag (data_id,group_id,tenant_id,tag_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info_tag'; /*****************************************// 数据库全名 = nacos_config // 表名称 = config_tags_relation //*****************************************/CREATE TABLE config_tags_relation ( id bigint(20) NOT NULL COMMENT 'id', tag_name varchar(128) NOT NULL COMMENT 'tag_name', tag_type varchar(64) DEFAULT NULL COMMENT 'tag_type', data_id varchar(255) NOT NULL COMMENT 'data_id', group_id varchar(128) NOT NULL COMMENT 'group_id', tenant_id varchar(128) DEFAULT '' COMMENT 'tenant_id', nid bigint(20) NOT NULL AUTO_INCREMENT, PRIMARY KEY (nid), UNIQUE KEY uk_configtagrelation_configidtag (id,tag_name,tag_type), KEY idx_tenant_id (tenant_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_tag_relation'; /*****************************************// 数据库全名 = nacos_config // 表名称 = group_capacity //*****************************************/CREATE TABLE group_capacity ( id bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID', group_id varchar(128) NOT NULL DEFAULT '' COMMENT 'Group ID，空字符表示整个集群', quota int(10) unsigned NOT NULL DEFAULT '0' COMMENT '配额，0表示使用默认值', usage int(10) unsigned NOT NULL DEFAULT '0' COMMENT '使用量', max_size int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个配置大小上限，单位为字节，0表示使用默认值', max_aggr_count int(10) unsigned NOT NULL DEFAULT '0' COMMENT '聚合子配置最大个数，，0表示使用默认值', max_aggr_size int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个聚合数据的子配置大小上限，单位为字节，0表示使用默认值', max_history_count int(10) unsigned NOT NULL DEFAULT '0' COMMENT '最大变更历史数量', gmt_create datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间', gmt_modified datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间', PRIMARY KEY (id), UNIQUE KEY uk_group_id (group_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='集群、各Group容量信息表'; /*****************************************// 数据库全名 = nacos_config // 表名称 = his_config_info //*****************************************/CREATE TABLE his_config_info ( id bigint(64) unsigned NOT NULL, nid bigint(20) unsigned NOT NULL AUTO_INCREMENT, data_id varchar(255) NOT NULL, group_id varchar(128) NOT NULL, app_name varchar(128) DEFAULT NULL COMMENT 'app_name', content longtext NOT NULL, md5 varchar(32) DEFAULT NULL, gmt_create datetime NOT NULL DEFAULT '2010-05-05 00:00:00', gmt_modified datetime NOT NULL DEFAULT '2010-05-05 00:00:00', src_user text, src_ip varchar(20) DEFAULT NULL, op_type char(10) DEFAULT NULL, tenant_id varchar(128) DEFAULT '' COMMENT '租户字段', PRIMARY KEY (nid), KEY idx_gmt_create (gmt_create), KEY idx_gmt_modified (gmt_modified), KEY idx_did (data_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='多租户改造'; /*****************************************// 数据库全名 = nacos_config // 表名称 = tenant_capacity //*****************************************/CREATE TABLE tenant_capacity ( id bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID', tenant_id varchar(128) NOT NULL DEFAULT '' COMMENT 'Tenant ID', quota int(10) unsigned NOT NULL DEFAULT '0' COMMENT '配额，0表示使用默认值', usage int(10) unsigned NOT NULL DEFAULT '0' COMMENT '使用量', max_size int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个配置大小上限，单位为字节，0表示使用默认值', max_aggr_count int(10) unsigned NOT NULL DEFAULT '0' COMMENT '聚合子配置最大个数', max_aggr_size int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个聚合数据的子配置大小上限，单位为字节，0表示使用默认值', max_history_count int(10) unsigned NOT NULL DEFAULT '0' COMMENT '最大变更历史数量', gmt_create datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间', gmt_modified datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间', PRIMARY KEY (id), UNIQUE KEY uk_tenant_id (tenant_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='租户容量信息表'; CREATE TABLE tenant_info ( id bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id', kp varchar(128) NOT NULL COMMENT 'kp', tenant_id varchar(128) default '' COMMENT 'tenant_id', tenant_name varchar(128) default '' COMMENT 'tenant_name', tenant_desc varchar(256) DEFAULT NULL COMMENT 'tenant_desc', create_source varchar(32) DEFAULT NULL COMMENT 'create_source', gmt_create bigint(20) NOT NULL COMMENT '创建时间', gmt_modified bigint(20) NOT NULL COMMENT '修改时间', PRIMARY KEY (id), UNIQUE KEY uk_tenant_info_kptenantid (kp,tenant_id), KEY idx_tenant_id (tenant_id)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='tenant_info'; CREATE TABLE users ( username varchar(50) NOT NULL PRIMARY KEY, password varchar(500) NOT NULL, enabled boolean NOT NULL); CREATE TABLE roles ( username varchar(50) NOT NULL, role varchar(50) NOT NULL); INSERT INTO users (username, password, enabled) VALUES ('nacos', '2a10
Linux版Nacos MySQL生产环境配置
- 预计需要，1个nginx 3个nacos注册中心 1个mysql
- Nacos下载linux版本
  - https://github.com/alibaba/nacos/releases/tag/1.1.4
  - nacos-server-1.1.4.tar.gz
  - 解压后安装
- 集群配置步骤（重点）
  - 1.Linux服务器上mysql数据库配置
    - SQL脚本在哪里
    - sql语句源文件
      - nacos-mysql.sql
    - 自己Linux机器上的Mysql数据库黏贴
      - 执行后结果
  - 2.application.properties配置
    - 位置
    - 内容 spring.datasource.platform=mysql db.num=1db.url.0=jdbc:mysql://1.7.0.1:3306/nacos_config?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=truedb.user=rootdb.password=HF_mysql_654321 mysql 授权远程访问GRANT ALL PRIVILEGES ON . TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;flush privileges;
  - 3.Linux服务器上nacos的集群配置cluster.conf
    - 梳理出3台nacos机器的不同服务端口号
    - 复制出cluster.conf
    - 内容
      - 这个IP不能写127.0.0.1,必须是Linux命令hostname -i能够识别的IP
  - 4.编辑Nacos的启动脚本startup.sh，使它能够接受不同的启动端
    - /mynacos/nacos/bin目录下有startup.sh
    - 在什么地方，修改什么，怎么修改
    - 思考
    - 修改内容
    - 执行方式
  - 5.Nginx的配置，由它作为负载均衡器
    - 修改nginx的配置文件
    - nginx.conf upstream cluster{ server 127.0.0.1:3333; server 127.0.0.1:4444; server 127.0.0.1:5555;} server{ listen 1111; server_name localhost; location /{ proxy_pass http://cluster; }....省略
    - 按照指定启动
  - 6.截止到此处，1个Nginx 3个nacos注册中心 1个mysql
    - 测试通过nginx访问nacos
      - https://写你自己虚拟机的ip:1111/nacos/#/login
    - 新建一个配置测试
    - linux服务器的mysql插入一条记录
- 测试
  - 微服务cloudalibaba-provider-payment9002启动注册进nacos集群
    - yml server-addr: 写你自己的虚拟机ip:1111
    - 结果
- 高可用小总结

# 19.SpringCloud Alibaba Sentinel实现熔断与限流

# Sentinel

官网
- https://github.com/alibaba/Sentinel
- 中文
  - https://github.com/alibaba/Sentinel/wiki/介绍
是什么
- 一句话解释，之前我们讲解过的Hystrix
去哪下
- https://github.com/alibaba/Sentinel/releases
能干嘛
怎么玩
- https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_sentinel
- 服务使用中的各种问题
  - 服务雪崩
  - 服务降级
  - 服务熔断
  - 服务限流

# 安装Sentinel控制台

sentinel组件由2部分组成
- 后台
- 前台8080
安装步骤
- 下载
  - https://github.com/alibaba/Sentinel/releases
  - 下载到本地sentinel-dashboard-1.7.0.jar
- 运行命令
  - 前提
    - java8环境OK
    - 8080端口不能被占用
  - 命令
    - java -jar sentinel-dashboard-1.7.0.jar
- 访问sentinel管理界面
  - http://localhost:8080
  - 登录账号密码均为sentinel

# 初始化演示工程

启动Nacos8848成功
- http://localhost:8848/nacos/#/login
Module
- cloudalibaba-sentinel-service8401
- POM <?xml version="1.0" encoding="UTF-8"?>cloud2020 com.atguigu.springcloud 1.0-SNAPSHOT 4.0.0 cloudalibaba-sentinel-service8401 com.atguigu.springcloud cloud-api-commons ${project.version} com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery com.alibaba.csp sentinel-datasource-nacos com.alibaba.cloud spring-cloud-starter-alibaba-sentinel org.springframework.cloud spring-cloud-starter-openfeign org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true cn.hutool hutool-all 4.6.3 org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test
- YML server: port: 8401spring: application: name: cloudalibaba-sentinel-service cloud: nacos: discovery: server-addr: localhost:8848 sentinel: transport: dashboard: localhost:8080 port: 8719 #默认8719，假如被占用了会自动从8719开始依次 1扫描。直至找到未被占用的端口management: endpoints: web: exposure: include: '*'
- 主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@EnableDiscoveryClient@SpringBootApplicationpublic class MainApp8401{ public static void main(String[] args) { SpringApplication.run(MainApp8401.class, args); }}
- 业务类FlowLimitController package com.atguigu.springcloud.alibaba.controller;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class FlowLimitController{ @GetMapping("/testA") public String testA() { return "------testA"; } @GetMapping("/testB") public String testB() { return "------testB"; }}
启动Sentinel8080
- java -jar sentinel-dashboard-1.7.0
启动微服务8401
启动8401微服务后查看sentienl控制台
- 空空如也，啥都没有
- Sentinel采用的懒加载说明
  - 执行一次访问即可
    - http://localhost:8401/testA
    - http://localhost:8401/testB
  - 效果
- 结论
  - sentinel8080正在监控微服务8401

# 流控规则

基本介绍
- 进一步解释说明
流控模式
- 直接（默认）
  - 直接->快速失败
    - 系统默认
  - 配置及说明
  - 测试
    - 快速点击访问http://localhost:8401/testA
    - 结果
      - Blocked by Sentinel (flow limiting)
    - 思考？？？
      - 直接调用默认报错信息，技术方面OK but，是否应该有我们自己的后续处理？
      - 类似有一个fallback的兜底方法？
- 关联
  - 是什么？
    - 当关联的资源达到阈值时，就限流自己
    - 当与A关联的资源B达到阈值后，就限流自己
    - B惹事，A挂了
  - 配置A
  - postman模拟并发密集访问testB
    - 访问testB成功
    - postman里新建多线程集合组
    - 将访问地址添加进新线程组
    - Run
      - 大批量线程高并发访问B，导致A失效了
  - 运行后发现testA挂了
    - 点击访问http://localhost:8401/testA
    - 结果
      - Blocked by Sentinel (flow limiting)
- 链路
  - 多个请求调用了同一个微服务
  - 家庭作业试试
流控效果
- 直接->快速失败（默认的流控处理）
  - 直接失败，抛出异常
    - Blocked by Sentinel (flow limiting)
  - 源码
    - com.alibaba.csp.sentinel.slots.block.flow.controller.DefaultController
- 预热
  - 说明
    - 公式：阈值除以coldFactor（默认值为3），经过预热时长后才会达到阈值
  - 官网
    - 默认coldFactor为3，即请求QPS从threshold/3开始，经预热时长逐渐升至设定的QPS阈值。
    - 限流冷启动
      - https://github.com/alibaba/Sentinel/wiki/限流---冷启动
  - 源码
    - com.alibaba.csp.sentinel.slots.block.flow.controller.WarmUpController
    - Subtopic
  - Warmup配置
  - 多次点击http://localhost:8401/testB
    - 刚开始不行，后续慢慢OK
  - 应用场景
- 排队等待
  - 匀速排队，阈值必须设置为QPS
  - 官网
  - 源码
    - com.alibaba.csp.sentinel.slots.block.flow.controller.RateLimiterController
  - 测试

# 降级规则

官网
基本介绍
- 进一步说明
- Sentinel的断路器是没有半开状态的
  - 半开的状态系统自动去检测是否请求有异常，没有异常就关闭断路器恢复使用，有异常则继续打开断路器不可用。具体可以参考Hystrix
  - 复习Hystrix
降级策略实战
- RT
  - 是什么
  - 测试
    - 代码 @GetMapping("/testD") public String testD() { try { TimeUnit.SECONDS.sleep(1); } catch (InterruptedException e) { e.printStackTrace(); } log.info("testD 测试RT"); return "------testD"; }
    - 配置
    - jmeter压测
    - 结论
- 异常比例
  - 是什么
  - 测试
    - 代码 @GetMapping("/testD") public String testD() { log.info("testD 测试RT"); int age = 10/0; return "------testD"; }
    - 配置
    - jmeter
    - 结论
- 异常数
  - 是什么
  - 异常数是按照分钟统计的
  - 测试
    - 代码 @GetMapping("/testE")public String testE(){ log.info("testE 测试异常数"); int age = 10/0; return "------testE 测试异常数";}
    - 配置 http://localhost:8401/testE
    - jmeter

# 热点key限流

基本介绍
- 是什么
官网
- https://github.com/alibaba/Sentinel/wiki/热点参数限流
承上启下复习start
- @SentinelResource
代码 @GetMapping("/testHotKey")@SentinelResource(value = "testHotKey",blockHandler = "deal_testHotKey")public String testHotKey(@RequestParam(value = "p1",required = false) String p1, @RequestParam(value = "p2",required = false) String p2) { //int age = 10/0; return "------testHotKey";}//兜底方法public String deal_testHotKey (String p1, String p2, BlockException exception){ return "------deal_testHotKey,o(╥﹏╥)o"; }
- com.alibaba.csp.sentinel.slots.block.BlockException
配置
- 配置
  - 1
    - @SentinelResource(value = "testHotKey")
    - 异常打到了前台用户界面看不到，不友好
  - 2
    - @SentinelResource(value = "testHotKey",blockHandler = "deal_testHotKey")
    - 方法testHostKey里面第一个参数只要QPS超过每秒1次，马上降级处理
    - 用了我们自己定义的
测试
- error
  - http://localhost:8401/testHotKey?p1=abc
- error
  - http://localhost:8401/testHotKey?p1=abc&p2=33
- right
  - http://localhost:8401/testHotKey?p2=abc
参数例外项
- 上述案例演示了第一个参数p1,当QPS超过1秒1次点击后马上被限流
- 特殊情况
  - 普通
    - 超过1秒钟一个后，达到阈值1后马上被限流
  - 我们期望p1参数当它是某个特殊值时，它的限流值和平时不一样
  - 特例
    - 假如当p1的值等于5时，它的阈值可以达到200
- 配置
  - Subtopic
    - 添加按钮不能忘
- 测试
  - http://localhost:8401/testHotKey?p1=5
  - http://localhost:8401/testHotKey?p1=3
  - 当p1等于5的时候，阈值变为200
  - 当p1不等于5的时候，阈值就是平常的1
- 前提条件
  - 热点参数的注意点，参数必须是基本类型或者String
其他
- 手贱添加异常看看....
  - 后面讲

# 系统规则

是什么
- https://github.com/alibaba/Sentinel/wiki/系统自适应限流
各项配置参数说明
配置全局QPS

# @SentinelResource

按资源名称限流后续处理
- 启动Nacos成功
- 启动Sentinel成功
- Module
  - cloudalibaba-sentinel-service8401
  - POM com.atguigu.springcloud cloud-api-commons ${project.version}
  - YML server: port: 8401spring: application: name: cloudalibaba-sentinel-service cloud: nacos: discovery: server-addr: localhost:8848 sentinel: transport: dashboard: localhost:8080 port: 8719 #默认8719，假如被占用了会自动从8719开始依次 1扫描。直至找到未被占用的端口management: endpoints: web: exposure: include: '*'
  - 业务类RateLimitController package com.atguigu.springcloud.alibaba.controller;import com.alibaba.csp.sentinel.annotation.SentinelResource;import com.alibaba.csp.sentinel.slots.block.BlockException;import com.atguigu.springcloud.entities.*;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class RateLimitController{ @GetMapping("/byResource") @SentinelResource(value = "byResource",blockHandler = "handleException") public CommonResult byResource() { return new CommonResult(200,"按资源名称限流测试OK",new Payment(2020L,"serial001")); } public CommonResult handleException(BlockException exception) { return new CommonResult(444,exception.getClass().getCanonicalName() "t 服务不可用"); }
  - 主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@EnableDiscoveryClient@SpringBootApplicationpublic class MainApp8401{ public static void main(String[] args) { SpringApplication.run(MainApp8401.class, args); }}
- 配置流控规则
  - 配置步骤
  - 图形配置和代码关系
  - 表示1秒钟内查询次数大于1，就跑到我们自定义的处流，限流
- 测试
  - 1秒钟点击1下，OK
  - 超过上述问题，疯狂点击，返回了自己定义的限流处理信息，限流发送
- 额外问题
  - 此时关闭微服务8401看看
  - Sentinel控制台，流控规则消失了？？？？？
    - 临时/持久？
按照Url地址限流后续处理
- 通过访问的URL来限流，会返回Sentinel自带默认的限流处理信息
- 业务类RateLimitController @GetMapping("/rateLimit/byUrl")@SentinelResource(value = "byUrl")public CommonResult byUrl(){ return new CommonResult(200,"按url限流测试OK",new Payment(2020L,"serial002"));}
- 访问一次
- Sentinel控制台配置
- 测试
  - 疯狂点击http://localhost:8401/rateLimit/byUrl
  - 结果
上面兜底方法面临的问题
客户自定义限流处理逻辑
- 创建customerBlockHandler类用于自定义限流处理逻辑
- 自定义限流处理类
  - CustomerBlockHandler package com.atguigu.springcloud.alibaba.myhandler;import com.alibaba.csp.sentinel.slots.block.BlockException;import com.atguigu.springcloud.entities.*;public class CustomerBlockHandler { public static CommonResult handleException(BlockException exception) { return new CommonResult(2020, "自定义限流处理信息....CustomerBlockHandler"); }}
- RateLimitController @GetMapping("/rateLimit/customerBlockHandler")@SentinelResource(value = "customerBlockHandler", blockHandlerClass = CustomerBlockHandler.class, blockHandler = "handlerException2")public CommonResult customerBlockHandler(){ return new CommonResult(200,"按客戶自定义",new Payment(2020L,"serial003"));}
- 启动微服务后先调用一次
  - http://localhost:8401/rateLimit/customerBlockHandler
- Sentinel控制台配置
- 测试后我们自定义的出来了
- 进一步说明
更多注解属性说明
- 多说一句
- Sentinel主要有三个核心API
  - SphU定义资源
  - Tracer定义统计
  - ContextUtil定义了上下文

# 服务熔断功能

sentinel整合ribbon openFeign fallback
Ribbon系列启动nacos和sentinel 提供者9003/9004 新建cloudalibaba-provider-payment9003/9004 POM com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery com.atguigu.springcloud cloud-api-commons {project.version} org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-devtools runtime true org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test YML server: port: 9003spring: application: name: nacos-payment-provider cloud: nacos: discovery: server-addr: localhost:8848 #配置Nacos地址management: endpoints: web: exposure: include: '*' 记得修改不同的端口号主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@SpringBootApplication@EnableDiscoveryClientpublic class PaymentMain9003{ public static void main(String[] args) { SpringApplication.run(PaymentMain9003.class, args); }} 业务类 package com.atguigu.springcloud.alibaba.controller;import com.atguigu.springcloud.alibaba.entities.CommonResult;import com.atguigu.springcloud.alibaba.entities.Payment;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RestController;import java.util.HashMap;@RestControllerpublic class PaymentController{ @Value("
Feign系列
- 修改84模块
- POM org.springframework.cloud spring-cloud-starter-openfeign
- YML server: port: 84spring: application: name: nacos-order-consumer cloud: nacos: discovery: server-addr: localhost:8848 sentinel: transport: dashboard: localhost:8080 port: 8719service-url: nacos-user-service: http://nacos-payment-provider#对Feign的支持feign: sentinel: enabled: true
- 业务类
  - 带@FeignClient注解的业务接口 package com.atguigu.springcloud.alibaba.service;import com.atguigu.springcloud.alibaba.entities.CommonResult;import com.atguigu.springcloud.alibaba.entities.Payment;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PathVariable;@FeignClient(value = "nacos-payment-provider",fallback = PaymentFallbackService.class)public interface PaymentService{ @GetMapping(value = "/paymentSQL/{id}") public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id);}
  - fallback = PaymentFallbackService.class
  - PaymentFallbackService实现类 package com.atguigu.springcloud.alibaba.service;import com.atguigu.springcloud.alibaba.entities.CommonResult;import com.atguigu.springcloud.alibaba.entities.Payment;import org.springframework.stereotype.Component;@Componentpublic class PaymentFallbackService implements PaymentService{ @Override public CommonResult<Payment> paymentSQL(Long id) { return new CommonResult<>(44444,"服务降级返回,---PaymentFallbackService",new Payment(id,"errorSerial")); }}
  - Controller // OpenFeign@Resourceprivate PaymentService paymentService;@GetMapping(value = "/consumer/paymentSQL/{id}")public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id) { return paymentService.paymentSQL(id);}
- 主启动
  - 添加@EnableFeignClients启动Feign的功能 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;@EnableDiscoveryClient@SpringBootApplication@EnableFeignClientspublic class OrderNacosMain84{ public static void main(String[] args) { SpringApplication.run(OrderNacosMain84.class, args); }}
- http://lcoalhost:84/consumer/openfeign/1
- http://lcoalhost:84/consumer/paymentSQL/1
- 测试84调用9003，此时故意关闭9003微服务提供者，看84消费侧自动降级，不会被耗死
熔断框架比较

# 规则持久化

是什么
- 一旦我们重启应用，Sentinel规则将消失，生产环境需要将配置规则进行持久化
怎么玩
- 将限流配置规则持久化进Nacos保存，只要刷新8401某个rest地址，sentinel控制台的流控规则就能看到，只要Nacos里面的配置不删除，针对8401上Sentinel上的流控规则持续有效
步骤
- 修改cloudalibaba-sentinel-service8401
- POM com.alibaba.csp sentinel-datasource-nacos
- YML server: port: 8401spring: application: name: cloudalibaba-sentinel-service cloud: nacos: discovery: server-addr: localhost:8848 #Nacos服务注册中心地址 sentinel: transport: dashboard: localhost:8080 #配置Sentinel dashboard地址 port: 8719 datasource: ds1: nacos: server-addr: localhost:8848 dataId: cloudalibaba-sentinel-service groupId: DEFAULT_GROUP data-type: json rule-type: flowmanagement: endpoints: web: exposure: include: '*'feign: sentinel: enabled: true # 激活Sentinel对Feign的支持
  - 添加Nacos数据源配置 spring: cloud: sentinel: datasource: ds1: nacos: server-addr:localhost:8848 dataid:${spring.application.name} groupid:DEFAULT_GROUP data-type:json rule-type:flow
- 添加Nacos业务规则配置
  - 内容解析 [ { "resource": "/retaLimit/byUrl", "limitApp": "default", "grade": 1, "count": 1, "strategy": 0, "controlBehavior": 0, "clusterMode": false }]
- 启动8401后刷新sentinel发现业务规则有了
- 快速访问测试接口
  - http://localhost:8401/rateLimit/byUrl
  - 默认
    - Subtopic
- 停止8401再看sentinel
- 重新启动8401再看sentinel
  - 扎一看还是没有，稍等一会儿
  - 多次调用
    - http://localhost:8401/rateLimit/byUrl
  - 重新配置出现了，持久化验证通过

# 20.SpringCloud Alibaba Seata处理分布式事务

# 分布式事务问题

分布式前
- 单机单库没这个问题
- 从1：1 -> 1:N -> N: N
分布式之后
一句话
- 一次业务操作需要跨多个数据源或需要跨多个系统进行远程调用，就会产生分布式事务问题

# Seata简介

是什么
- Seata是一款开源的分布式事务解决方案，致力于在微服务架构下提供高性能和简单易用的分布式事务服务
- 官网地址
  - http://seata.io/zh-cn/
能干嘛
- 一个典型的分布式事务过程
  - 分布式事务处理过程的-ID 三组件模型
    - Transaction ID XID
      - 全局唯一的事务ID
    - 3组件概念
      - Transaction Coordinator(TC)
      - 事务协调器，维护全局事务的运行状态，负责协调并驱动全局事务的提交或回滚;
      - Transaction Manager(TM)
      - 控制全局事务的边界，负责开启一个全局事务，并最终发起全局提交或全局回滚的决议;
      - Resource Manager(RM)
      - 控制分支事务，负责分支注册，状态汇报，并接收事务协调器的指令，驱动分支（本地）事务的提交和回滚；
  - 处理过程
去哪下
- 发布说明:https://github.com/seata/seata/releases
怎么玩
- Spring 本地@Transactional
- 全局@GlobalTransactional
  - SEATA的分布式交易解决方案

# Seata-Server安装

1.官网地址
- http://seata.io/zh-cn/
2.下载版本
3.seata-server-0.9.0.zip解压到指定目录并修改conf目录下的file.conf配置文件
- 先备份原始file.conf文件
- 主要修改：自定义事务组名称事务日志存储模式为db 数据库连接信息
- file.conf
  - service模块 vgroup_mapping.my_test_tx_group = "fsp_tx_group"
  - store模块 mode = "db" url = "jdbc:mysql://127.0.0.1:3306/seata" user = "root" password = "你自己的密码"
4.mysql5.7数据库新建库seata
5.在seata库里建表
- 建表db_store.sql在seata-server-0.9.0seataconf目录里面
  - db_store.sql
- SQL -- the table to store GlobalSession datadrop table if exists global_table;create table global_table ( xid varchar(128) not null, transaction_id bigint, status tinyint not null, application_id varchar(32), transaction_service_group varchar(32), transaction_name varchar(128), timeout int, begin_time bigint, application_data varchar(2000), gmt_create datetime, gmt_modified datetime, primary key (xid), key idx_gmt_modified_status (gmt_modified, status), key idx_transaction_id (transaction_id));-- the table to store BranchSession datadrop table if exists branch_table;create table branch_table ( branch_id bigint not null, xid varchar(128) not null, transaction_id bigint , resource_group_id varchar(32), resource_id varchar(256) , lock_key varchar(128) , branch_type varchar(8) , status tinyint, client_id varchar(64), application_data varchar(2000), gmt_create datetime, gmt_modified datetime, primary key (branch_id), key idx_xid (xid));-- the table to store lock datadrop table if exists lock_table;create table lock_table ( row_key varchar(128) not null, xid varchar(96), transaction_id long , branch_id long, resource_id varchar(256) , table_name varchar(32) , pk varchar(36) , gmt_create datetime , gmt_modified datetime, primary key(row_key));
6.修改seata-server-0.9.0seataconf目录下的registry.conf配置文件 registry { # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa type = "nacos" nacos { serverAddr = "localhost:8848" namespace = "" cluster = "default" }目的是：指明注册中心为nacos，及修改nacos连接信息
7.先启动Nacos端口号8848
8.再启动seata-server
- softsseata-server-0.9.0seatabin
  - seata-server.bat

# 订单/库存/账户业务数据库准备

以下演示都需要先启动Nacos后启动Seata，保证两个都OK
- Seata没启动报错no available server to connect
分布式事务业务说明
- 业务说明
- 下订单-->扣库存-->减账户（余额）
创建业务数据库
- seata_order: 存储订单的数据库
- seata_storage:存储库存的数据库
- seata_account: 存储账户信息的数据库
- 建表SQL CREATE DATABASE seata_order； CREATE DATABASE seata_storage； CREATE DATABASE seata_account；
按照上述3库分别建对应业务表
- seata_order库下建t_order表 CREATE TABLE t_order( id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY, user_id BIGINT(11) DEFAULT NULL COMMENT '用户id', product_id BIGINT(11) DEFAULT NULL COMMENT '产品id', count INT(11) DEFAULT NULL COMMENT '数量', money DECIMAL(11,0) DEFAULT NULL COMMENT '金额', status INT(1) DEFAULT NULL COMMENT '订单状态：0：创建中; 1：已完结') ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8; SELECT * FROM t_order;
- seata_storage库下建t_storage表 CREATE TABLE t_storage( id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY, product_id BIGINT(11) DEFAULT NULL COMMENT '产品id', 'total INT(11) DEFAULT NULL COMMENT '总库存', used INT(11) DEFAULT NULL COMMENT '已用库存', residue INT(11) DEFAULT NULL COMMENT '剩余库存') ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8; INSERT INTO seata_storage.t_storage(id,product_id,total,used,residue)VALUES('1','1','100','0','100'); SELECT * FROM t_storage;
- seata_account库下建t_account表 CREATE TABLE t_account( id BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'id', user_id BIGINT(11) DEFAULT NULL COMMENT '用户id', total DECIMAL(10,0) DEFAULT NULL COMMENT '总额度', used DECIMAL(10,0) DEFAULT NULL COMMENT '已用余额', residue DECIMAL(10,0) DEFAULT '0' COMMENT '剩余可用额度') ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8; INSERT INTO seata_account.t_account(id,user_id,total,used,residue) VALUES('1','1','1000','0','1000') SELECT * FROM t_account;
按照上述3库分别建对应的回滚日志表
- 订单-库存-账户3个库下都需要建各自的回滚日志表
- seata-server-0.9.0seataconf目录下的db_undo_log.sql
- 建表SQL drop table undo_log;CREATE TABLE undo_log ( id bigint(20) NOT NULL AUTO_INCREMENT, branch_id bigint(20) NOT NULL, xid varchar(100) NOT NULL, context varchar(128) NOT NULL, rollback_info longblob NOT NULL, log_status int(11) NOT NULL, log_created datetime NOT NULL, log_modified datetime NOT NULL, ext varchar(100) DEFAULT NULL, PRIMARY KEY (id), UNIQUE KEY ux_undo_log (xid,branch_id)) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
最终效果

# 订单/库存/账户业务微服务准备

业务需求
- 下订单->减库存->扣余额->改（订单）状态
新建订单Order-Module
- 1.seata-order-service2001
- 2.POM com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery com.alibaba.cloud spring-cloud-starter-alibaba-seata seata-all io.seata io.seata seata-all 0.9.0 org.springframework.cloud spring-cloud-starter-openfeign org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-actuator mysql mysql-connector-java 5.1.37 com.alibaba druid-spring-boot-starter 1.1.10 org.mybatis.spring.boot mybatis-spring-boot-starter 2.0.0 org.springframework.boot spring-boot-starter-test test org.projectlombok lombok true
- 3.YML server: port: 2001spring: application: name: seata-order-service cloud: alibaba: seata: #自定义事务组名称需要与seata-server中的对应 tx-service-group: fsp_tx_group nacos: discovery: server-addr: localhost:8848 datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/seata_order username: root password: 1111111feign: hystrix: enabled: falselogging: level: io: seata: infomybatis: mapperLocations: classpath:mapper/*.xml
- 4.file.conf transport { # tcp udt unix-domain-socket type = "TCP" #NIO NATIVE server = "NIO" #enable heartbeat heartbeat = true #thread factory for netty thread-factory { boss-thread-prefix = "NettyBoss" worker-thread-prefix = "NettyServerNIOWorker" server-executor-thread-prefix = "NettyServerBizHandler" share-boss-worker = false client-selector-thread-prefix = "NettyClientSelector" client-selector-thread-size = 1 client-worker-thread-prefix = "NettyClientWorkerThread" # netty boss thread size,will not be used for UDT boss-thread-size = 1 #auto default pin or 8 worker-thread-size = 8 } shutdown { # when destroy server, wait seconds wait = 3 } serialization = "seata" compressor = "none"}service { vgroup_mapping.fsp_tx_group = "default" default.grouplist = "127.0.0.1:8091" enableDegrade = false disable = false max.commit.retry.timeout = "-1" max.rollback.retry.timeout = "-1" disableGlobalTransaction = false}client { async.commit.buffer.limit = 10000 lock { retry.internal = 10 retry.times = 30 } report.retry.count = 5 tm.commit.retry.count = 1 tm.rollback.retry.count = 1}## transaction log storestore { ## store mode: file、db mode = "db" ## file store file { dir = "sessionStore" # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions max-branch-session-size = 16384 # globe session size , if exceeded throws exceptions max-global-session-size = 512 # file buffer size , if exceeded allocate new buffer file-write-buffer-cache-size = 16384 # when recover batch read size session.reload.read_size = 100 # async, sync flush-disk-mode = async } ## database store db { ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc. datasource = "dbcp" ## mysql/oracle/h2/oceanbase etc. db-type = "mysql" driver-class-name = "com.mysql.jdbc.Driver" url = "jdbc:mysql://127.0.0.1:3306/seata" user = "root" password = "123456" min-conn = 1 max-conn = 3 global.table = "global_table" branch.table = "branch_table" lock-table = "lock_table" query-limit = 100 }}lock { ## the lock store mode: local、remote mode = "remote" local { ## store locks in user's database } remote { ## store locks in the seata's server }}recovery { #schedule committing retry period in milliseconds committing-retry-period = 1000 #schedule asyn committing retry period in milliseconds asyn-committing-retry-period = 1000 #schedule rollbacking retry period in milliseconds rollbacking-retry-period = 1000 #schedule timeout retry period in milliseconds timeout-retry-period = 1000}transaction { undo.data.validation = true undo.log.serialization = "jackson" undo.log.save.days = 7 #schedule delete expired undo_log in milliseconds undo.log.delete.period = 86400000 undo.log.table = "undo_log"}## metrics settingsmetrics { enabled = false registry-type = "compact" # multi exporters use comma divided exporter-list = "prometheus" exporter-prometheus-port = 9898}support { ## spring spring { # auto proxy the DataSource bean datasource.autoproxy = false }}
- 5.registry.conf registry { # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa type = "nacos" nacos { serverAddr = "localhost:8848" namespace = "" cluster = "default" } eureka { serviceUrl = "http://localhost:8761/eureka" application = "default" weight = "1" } redis { serverAddr = "localhost:6379" db = "0" } zk { cluster = "default" serverAddr = "127.0.0.1:2181" session.timeout = 6000 connect.timeout = 2000 } consul { cluster = "default" serverAddr = "127.0.0.1:8500" } etcd3 { cluster = "default" serverAddr = "http://localhost:2379" } sofa { serverAddr = "127.0.0.1:9603" application = "default" region = "DEFAULT_ZONE" datacenter = "DefaultDataCenter" cluster = "default" group = "SEATA_GROUP" addressWaitTime = "3000" } file { name = "file.conf" }}config { # file、nacos 、apollo、zk、consul、etcd3 type = "file" nacos { serverAddr = "localhost" namespace = "" } consul { serverAddr = "127.0.0.1:8500" } apollo { app.id = "seata-server" apollo.meta = "http://192.168.1.204:8801" } zk { serverAddr = "127.0.0.1:2181" session.timeout = 6000 connect.timeout = 2000 } etcd3 { serverAddr = "http://localhost:2379" } file { name = "file.conf" }}
- 6.domain
  - CommonResult package com.atguigu.springcloud.alibaba.domain;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@AllArgsConstructor@NoArgsConstructorpublic class CommonResult<T>{ private Integer code; private String message; private T data; public CommonResult(Integer code, String message) { this(code,message,null); }}
  - Order package com.atguigu.springcloud.alibaba.domain;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import java.math.BigDecimal;@Data@AllArgsConstructor@NoArgsConstructorpublic class Order{ private Long id; private Long userId; private Long productId; private Integer count; private BigDecimal money; private Integer status; //订单状态：0：创建中；1：已完结}
- 7.Dao接口及实现
  - OrderDao package com.atguigu.springcloud.alibaba.dao; import com.atguigu.springcloud.alibaba.domain.Order;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param; @Mapperpublic interface OrderDao{ //新建订单 void create(Order order); //修改订单状态，从零改为1 void update(@Param("userId") Long userId,@Param("status") Integer status);}
  - resources文件夹下新建mapper文件夹后添加
    - OrderMapper.xml <?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > insert into t_order (id,user_id,product_id,count,money,status) values (null,#{userId},#{productId},#{count},#{money},0); update t_order set status = 1 where user_id=#{userId} and status = #{status};
- 8.Service接口及实现
  - OrderService package com.atguigu.springcloud.alibaba.service;import com.atguigu.springcloud.alibaba.domain.Order;public interface OrderService{ void create(Order order);}
    - OrderServiceImpl package com.atguigu.springcloud.alibaba.service.impl; import com.atguigu.springcloud.alibaba.dao.OrderDao;import com.atguigu.springcloud.alibaba.domain.Order;import com.atguigu.springcloud.alibaba.service.AccountService;import com.atguigu.springcloud.alibaba.service.OrderService;import com.atguigu.springcloud.alibaba.service.StorageService;import io.seata.spring.annotation.GlobalTransactional;import lombok.extern.slf4j.Sl f4j;import org.springframework.stereotype.Service; import javax.annotation.Resource; @Service@Slf4jpublic class OrderServiceImpl implements OrderService{ @Resource private OrderDao orderDao; @Resource private StorageService storageService; @Resource private AccountService accountService; /** * 创建订单->调用库存服务扣减库存->调用账户服务扣减账户余额->修改订单状态 */ @Override @GlobalTransactional(name = "fsp-create-order",rollbackFor = Exception.class) public void create(Order order){ log.info("----->开始新建订单"); //新建订单 orderDao.create(order); //扣减库存 log.info("----->订单微服务开始调用库存，做扣减Count"); storageService.decrease(order.getProductId(),order.getCount()); log.info("----->订单微服务开始调用库存，做扣减end"); //扣减账户 log.info("----->订单微服务开始调用账户，做扣减Money"); accountService.decrease(order.getUserId(),order.getMoney()); log.info("----->订单微服务开始调用账户，做扣减end"); //修改订单状态，从零到1代表已经完成 log.info("----->修改订单状态开始"); orderDao.update(order.getUserId(),0); log.info("----->修改订单状态结束"); log.info("----->下订单结束了"); }}
  - StorageService package com.atguigu.springcloud.alibaba.service;import com.atguigu.springcloud.alibaba.domain.CommonResult;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestParam;import java.math.BigDecimal;@FeignClient(value = "seata-storage-service")public interface StorageService{ @PostMapping(value = "/storage/decrease") CommonResult decrease(@RequestParam("productId") Long productId, @RequestParam("count") Integer count);}
  - AccountService package com.atguigu.springcloud.alibaba.service;import com.atguigu.springcloud.alibaba.domain.CommonResult;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestParam;import java.math.BigDecimal;@FeignClient(value = "seata-account-service")public interface AccountService{ @PostMapping(value = "/account/decrease") CommonResult decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);}
- 9.Controller package com.atguigu.springcloud.alibaba.controller;import com.atguigu.springcloud.alibaba.domain.CommonResult;import com.atguigu.springcloud.alibaba.domain.Order;import com.atguigu.springcloud.alibaba.service.OrderService;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;@RestControllerpublic class OrderController{ @Resource private OrderService orderService; @GetMapping("/order/create") public CommonResult create(Order order) { orderService.create(order); return new CommonResult(200,"订单创建成功"); }}
- 10.Config配置
  - MyBatisConfig package com.atguigu.springcloud.alibaba.config;import org.mybatis.spring.annotation.MapperScan;import org.springframework.context.annotation.Configuration;@Configuration@MapperScan({"com.atguigu.springcloud.alibaba.dao"})public class MyBatisConfig {}
  - DataSourceProxyConfig package com.atguigu.springcloud.alibaba.config;import com.alibaba.druid.pool.DruidDataSource;import io.seata.rm.datasource.DataSourceProxy;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.transaction.SpringManagedTransactionFactory;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;@Configurationpublic class DataSourceProxyConfig { @Value("${mybatis.mapperLocations}") private String mapperLocations; @Bean @ConfigurationProperties(prefix = "spring.datasource") public DataSource druidDataSource(){ return new DruidDataSource(); } @Bean public DataSourceProxy dataSourceProxy(DataSource dataSource) { return new DataSourceProxy(dataSource); } @Bean public SqlSessionFactory sqlSessionFactoryBean(DataSourceProxy dataSourceProxy) throws Exception { SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); sqlSessionFactoryBean.setDataSource(dataSourceProxy); sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations)); sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory()); return sqlSessionFactoryBean.getObject(); }}
- 11.主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;@EnableDiscoveryClient@EnableFeignClients@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消数据源自动创建的配置public class SeataOrderMainApp2001{ public static void main(String[] args) { SpringApplication.run(SeataOrderMainApp2001.class, args); }}
新建库存Storage-Module
- 1.seata-order-service2002
- 2.POM com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery com.alibaba.cloud spring-cloud-starter-alibaba-seata seata-all io.seata io.seata seata-all 0.9.0 org.springframework.cloud spring-cloud-starter-openfeign org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test org.mybatis.spring.boot mybatis-spring-boot-starter 2.0.0 mysql mysql-connector-java 5.1.37 com.alibaba druid-spring-boot-starter 1.1.10 org.projectlombok lombok true
- 3.YML server: port: 2002spring: application: name: seata-storage-service cloud: alibaba: seata: tx-service-group: fsp_tx_group nacos: discovery: server-addr: localhost:8848 datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/seata_storage username: root password: 111111logging: level: io: seata: infomybatis: mapperLocations: classpath:mapper/*.xml
- 4.file.conf transport { # tcp udt unix-domain-socket type = "TCP" #NIO NATIVE server = "NIO" #enable heartbeat heartbeat = true #thread factory for netty thread-factory { boss-thread-prefix = "NettyBoss" worker-thread-prefix = "NettyServerNIOWorker" server-executor-thread-prefix = "NettyServerBizHandler" share-boss-worker = false client-selector-thread-prefix = "NettyClientSelector" client-selector-thread-size = 1 client-worker-thread-prefix = "NettyClientWorkerThread" # netty boss thread size,will not be used for UDT boss-thread-size = 1 #auto default pin or 8 worker-thread-size = 8 } shutdown { # when destroy server, wait seconds wait = 3 } serialization = "seata" compressor = "none"}service { #vgroup->rgroup vgroup_mapping.fsp_tx_group = "default" #only support single node default.grouplist = "127.0.0.1:8091" #degrade current not support enableDegrade = false #disable disable = false #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent max.commit.retry.timeout = "-1" max.rollback.retry.timeout = "-1" disableGlobalTransaction = false}client { async.commit.buffer.limit = 10000 lock { retry.internal = 10 retry.times = 30 } report.retry.count = 5 tm.commit.retry.count = 1 tm.rollback.retry.count = 1}transaction { undo.data.validation = true undo.log.serialization = "jackson" undo.log.save.days = 7 #schedule delete expired undo_log in milliseconds undo.log.delete.period = 86400000 undo.log.table = "undo_log"}support { ## spring spring { # auto proxy the DataSource bean datasource.autoproxy = false }}
- 5.registry.conf registry { # file 、nacos 、eureka、redis、zk type = "nacos" nacos { serverAddr = "localhost:8848" namespace = "" cluster = "default" } eureka { serviceUrl = "http://localhost:8761/eureka" application = "default" weight = "1" } redis { serverAddr = "localhost:6381" db = "0" } zk { cluster = "default" serverAddr = "127.0.0.1:2181" session.timeout = 6000 connect.timeout = 2000 } file { name = "file.conf" }}config { # file、nacos 、apollo、zk type = "file" nacos { serverAddr = "localhost" namespace = "" cluster = "default" } apollo { app.id = "fescar-server" apollo.meta = "http://192.168.1.204:8801" } zk { serverAddr = "127.0.0.1:2181" session.timeout = 6000 connect.timeout = 2000 } file { name = "file.conf" }}
- 6.domain
  - CommonResult package com.atguigu.springcloud.alibaba.domain;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@AllArgsConstructor@NoArgsConstructorpublic class CommonResult<T>{ private Integer code; private String message; private T data; public CommonResult(Integer code, String message) { this(code,message,null); }}
  - Storage package com.atguigu.springcloud.alibaba.domain;import lombok.Data;@Datapublic class Storage { private Long id; // 产品id private Long productId; //总库存 private Integer total; //已用库存 private Integer used; //剩余库存 private Integer residue;}
- 7.Dao接口及实现
  - StorageDao package com.atguigu.springcloud.alibaba.dao;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param;@Mapperpublic interface StorageDao { //扣减库存信息 void decrease(@Param("productId") Long productId, @Param("count") Integer count);}
  - resources文件夹下新建mapper文件夹后添加
    - StorageMapper.xml <?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > UPDATE t_storage SET used = used #{count},residue = residue - #{count} WHERE product_id = #{productId}
- 8.Service接口及实现
  - StorageService package com.atguigu.springcloud.alibaba.service;public interface StorageService { // 扣减库存 void decrease(Long productId, Integer count);}
    - StorageServiceImpl package com.atguigu.springcloud.alibaba.service.impl;import com.atguigu.springcloud.alibaba.dao.StorageDao;import com.atguigu.springcloud.alibaba.service.StorageService ;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import javax.annotation.Resource;@Servicepublic class StorageServiceImpl implements StorageService { private static final Logger LOGGER = LoggerFactory.getLogger(StorageServiceImpl.class); @Resource private StorageDao storageDao; // 扣减库存 @Override public void decrease(Long productId, Integer count) { LOGGER.info("------->storage-service中扣减库存开始"); storageDao.decrease(productId,count); LOGGER.info("------->storage-service中扣减库存结束"); }}
- 9.Controller package com.atguigu.springcloud.alibaba.controller;import com.atguigu.springcloud.alibaba.domain.CommonResult ;import com.atguigu.springcloud.alibaba.service.StorageService ;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class StorageController { @Autowired private StorageService storageService; //扣减库存 @RequestMapping("/storage/decrease") public CommonResult decrease(Long productId, Integer count) { storageService.decrease(productId, count); return new CommonResult(200,"扣减库存成功！"); }}
- 10.Config配置
  - MyBatisConfig package com.atguigu.springcloud.alibaba.config;import org.mybatis.spring.annotation.MapperScan;import org.springframework.context.annotation.Configuration;@Configuration@MapperScan({"com.atguigu.springcloud.alibaba.dao"})public class MyBatisConfig {}
  - DataSourceProxyConfig package com.atguigu.springcloud.alibaba.config;import com.alibaba.druid.pool.DruidDataSource;import io.seata.rm.datasource.DataSourceProxy;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.transaction.SpringManagedTransactionFactory;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;@Configurationpublic class DataSourceProxyConfig { @Value("${mybatis.mapperLocations}") private String mapperLocations; @Bean @ConfigurationProperties(prefix = "spring.datasource") public DataSource druidDataSource(){ return new DruidDataSource(); } @Bean public DataSourceProxy dataSourceProxy(DataSource dataSource) { return new DataSourceProxy(dataSource); } @Bean public SqlSessionFactory sqlSessionFactoryBean(DataSourceProxy dataSourceProxy) throws Exception { SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); sqlSessionFactoryBean.setDataSource(dataSourceProxy); sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations)); sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory()); return sqlSessionFactoryBean.getObject(); }}
- 11.主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.concurrent.ForkJoinWorkerThread;@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)@EnableDiscoveryClient@EnableFeignClientspublic class SeataStorageServiceApplication2002{ public static void main(String[] args) { SpringApplication.run(SeataStorageServiceApplication2002.class, args); }}
新建账户Account-Module
- Subtopic
- 1.seata-order-service2003
- 2.POM com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery com.alibaba.cloud spring-cloud-starter-alibaba-seata seata-all io.seata io.seata seata-all 0.9.0 org.springframework.cloud spring-cloud-starter-openfeign org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test org.mybatis.spring.boot mybatis-spring-boot-starter 2.0.0 mysql mysql-connector-java 5.1.37 com.alibaba druid-spring-boot-starter 1.1.10 org.projectlombok lombok true
- 3.YML server: port: 2003spring: application: name: seata-account-service cloud: alibaba: seata: tx-service-group: fsp_tx_group nacos: discovery: server-addr: localhost:8848 datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/seata_account username: root password: 1111111feign: hystrix: enabled: falselogging: level: io: seata: infomybatis: mapperLocations: classpath:mapper/*.xml
- 4.file.conf transport { # tcp udt unix-domain-socket type = "TCP" #NIO NATIVE server = "NIO" #enable heartbeat heartbeat = true #thread factory for netty thread-factory { boss-thread-prefix = "NettyBoss" worker-thread-prefix = "NettyServerNIOWorker" server-executor-thread-prefix = "NettyServerBizHandler" share-boss-worker = false client-selector-thread-prefix = "NettyClientSelector" client-selector-thread-size = 1 client-worker-thread-prefix = "NettyClientWorkerThread" # netty boss thread size,will not be used for UDT boss-thread-size = 1 #auto default pin or 8 worker-thread-size = 8 } shutdown { # when destroy server, wait seconds wait = 3 } serialization = "seata" compressor = "none"}service { vgroup_mapping.fsp_tx_group = "default" #修改自定义事务组名称 default.grouplist = "127.0.0.1:8091" enableDegrade = false disable = false max.commit.retry.timeout = "-1" max.rollback.retry.timeout = "-1" disableGlobalTransaction = false}client { async.commit.buffer.limit = 10000 lock { retry.internal = 10 retry.times = 30 } report.retry.count = 5 tm.commit.retry.count = 1 tm.rollback.retry.count = 1}## transaction log storestore { ## store mode: file、db mode = "db" ## file store file { dir = "sessionStore" # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions max-branch-session-size = 16384 # globe session size , if exceeded throws exceptions max-global-session-size = 512 # file buffer size , if exceeded allocate new buffer file-write-buffer-cache-size = 16384 # when recover batch read size session.reload.read_size = 100 # async, sync flush-disk-mode = async } ## database store db { ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc. datasource = "dbcp" ## mysql/oracle/h2/oceanbase etc. db-type = "mysql" driver-class-name = "com.mysql.jdbc.Driver" url = "jdbc:mysql://127.0.0.1:3306/seata" user = "root" password = "123456" min-conn = 1 max-conn = 3 global.table = "global_table" branch.table = "branch_table" lock-table = "lock_table" query-limit = 100 }}lock { ## the lock store mode: local、remote mode = "remote" local { ## store locks in user's database } remote { ## store locks in the seata's server }}recovery { #schedule committing retry period in milliseconds committing-retry-period = 1000 #schedule asyn committing retry period in milliseconds asyn-committing-retry-period = 1000 #schedule rollbacking retry period in milliseconds rollbacking-retry-period = 1000 #schedule timeout retry period in milliseconds timeout-retry-period = 1000}transaction { undo.data.validation = true undo.log.serialization = "jackson" undo.log.save.days = 7 #schedule delete expired undo_log in milliseconds undo.log.delete.period = 86400000 undo.log.table = "undo_log"}## metrics settingsmetrics { enabled = false registry-type = "compact" # multi exporters use comma divided exporter-list = "prometheus" exporter-prometheus-port = 9898}support { ## spring spring { # auto proxy the DataSource bean datasource.autoproxy = false }}
- 5.registry.conf registry { # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa type = "nacos" nacos { serverAddr = "localhost:8848" namespace = "" cluster = "default" } eureka { serviceUrl = "http://localhost:8761/eureka" application = "default" weight = "1" } redis { serverAddr = "localhost:6379" db = "0" } zk { cluster = "default" serverAddr = "127.0.0.1:2181" session.timeout = 6000 connect.timeout = 2000 } consul { cluster = "default" serverAddr = "127.0.0.1:8500" } etcd3 { cluster = "default" serverAddr = "http://localhost:2379" } sofa { serverAddr = "127.0.0.1:9603" application = "default" region = "DEFAULT_ZONE" datacenter = "DefaultDataCenter" cluster = "default" group = "SEATA_GROUP" addressWaitTime = "3000" } file { name = "file.conf" }}config { # file、nacos 、apollo、zk、consul、etcd3 type = "file" nacos { serverAddr = "localhost" namespace = "" } consul { serverAddr = "127.0.0.1:8500" } apollo { app.id = "seata-server" apollo.meta = "http://192.168.1.204:8801" } zk { serverAddr = "127.0.0.1:2181" session.timeout = 6000 connect.timeout = 2000 } etcd3 { serverAddr = "http://localhost:2379" } file { name = "file.conf" }}
- 6.domain
  - CommonResult package com.atguigu.springcloud.alibaba.domain;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@AllArgsConstructor@NoArgsConstructorpublic class CommonResult<T>{ private Integer code; private String message; private T data; public CommonResult(Integer code, String message) { this(code,message,null); }}
  - Account package com.atguigu.springcloud.alibaba.domain;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import java.math.BigDecimal;@Data@AllArgsConstructor@NoArgsConstructorpublic class Account { private Long id; /** * 用户id / private Long userId; /* * 总额度 / private BigDecimal total; /* * 已用额度 / private BigDecimal used; /* * 剩余额度 */ private BigDecimal residue;}
- 7.Dao接口及实现
  - AccountDao package com.atguigu.springcloud.alibaba.dao;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param;import org.springframework.stereotype.Component;import org.springframework.stereotype.Repository;import java.math.BigDecimal;@Mapperpublic interface AccountDao { /** * 扣减账户余额 */ void decrease(@Param("userId") Long userId, @Param("money") BigDecimal money);}
  - resources文件夹下新建mapper文件夹后添加
    - AccountMapper.xml <?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > UPDATE t_account SET residue = residue - #{money},used = used #{money} WHERE user_id = #{userId};
- 8.Service接口及实现
  - AccountService package com.atguigu.springcloud.alibaba.service;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import java.math.BigDecimal;public interface AccountService { /** * 扣减账户余额 */ void decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);}
    - AccountServiceImpl package com.atguigu.springcloud.alibaba.service.impl;import com.atguigu.springcloud.alibaba.dao.AccountDao;import com.atguigu.springcloud.alibaba.service.AccountService ;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import javax.annotation.Resource;import java.math.BigDecimal;import java.util.concurrent.TimeUnit;/** * 账户业务实现类 /@Servicepublic class AccountServiceImpl implements AccountService { private static final Logger LOGGER = LoggerFactory.getLogger(AccountServiceImpl.class); @Resource AccountDao accountDao; /* * 扣减账户余额 */ @Override public void decrease(Long userId, BigDecimal money) { LOGGER.info("------->account-service中扣减账户余额开始"); try { TimeUnit.SECONDS.sleep(20); } catch (InterruptedException e) { e.printStackTrace(); } accountDao.decrease(userId,money); LOGGER.info("------->account-service中扣减账户余额结束"); }}
- 9.Controller package com.atguigu.springcloud.alibaba.controller;import com.atguigu.springcloud.alibaba.domain.CommonResult ;import com.atguigu.springcloud.alibaba.service.AccountService ;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;import java.math.BigDecimal;@RestControllerpublic class AccountController { @Resource AccountService accountService; /** * 扣减账户余额 */ @RequestMapping("/account/decrease") public CommonResult decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money){ accountService.decrease(userId,money); return new CommonResult(200,"扣减账户余额成功！"); }}
- 10.Config配置
  - MyBatisConfig package com.atguigu.springcloud.alibaba.config;import org.mybatis.spring.annotation.MapperScan;import org.springframework.context.annotation.Configuration;@Configuration@MapperScan({"com.atguigu.springcloud.alibaba.dao"})public class MyBatisConfig {}
  - DataSourceProxyConfig package com.atguigu.springcloud.alibaba.config;import com.alibaba.druid.pool.DruidDataSource;import io.seata.rm.datasource.DataSourceProxy;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.transaction.SpringManagedTransactionFactory;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;@Configurationpublic class DataSourceProxyConfig { @Value("${mybatis.mapperLocations}") private String mapperLocations; @Bean @ConfigurationProperties(prefix = "spring.datasource") public DataSource druidDataSource(){ return new DruidDataSource(); } @Bean public DataSourceProxy dataSourceProxy(DataSource dataSource) { return new DataSourceProxy(dataSource); } @Bean public SqlSessionFactory sqlSessionFactoryBean(DataSourceProxy dataSourceProxy) throws Exception { SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); sqlSessionFactoryBean.setDataSource(dataSourceProxy); sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations)); sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory()); return sqlSessionFactoryBean.getObject(); }}
- 11.主启动 package com.atguigu.springcloud.alibaba;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)@EnableDiscoveryClient@EnableFeignClientspublic class SeataAccountMainApp2003{ public static void main(String[] args) { SpringApplication.run(SeataAccountMainApp2003.class, args); }}

# Test

下订单->减库存->扣余额->改（订单）状态
数据库初始情况
正常下单
- http://localhost:2001/order/create?userid=1&producrid=1&counr=10&money=100
- 数据库情况
超时异常，没加@GlobalTransactional
- AccountServiceImpl添加超时
- 数据库情况
- 故障情况
  - 当库存和账户余额扣减后，订单状态并没有设置为已经完成，没有从零改为1
  - 而且由于feign的重试机制，账户余额还有可能被多次扣减
超时异常，添加@GlobalTransactional
- AccountServiceImpl添加超时
- OrderServiceImpl@GlobalTransactional
- 下单后数据库数据并没有任何改变
  - 记录都添加不进来

# Seata之原理简介

Seata
- 2019年1月份蚂蚁金服和阿里巴巴共同开源的分布式事务解决方案
- Simple Extensible Autonomous Transaction Architecture,简单可扩展自治事务框架
- 2020起初，参加工作后用1.0以后的版本
  - Subtopic
再看TC/TM/RM三大组件
- 分布式事务的执行流程
  - TM开启分布式事务(TM向TC注册全局事务记录)
  - 换业务场景，编排数据库，服务等事务内资源（RM向TC汇报资源准备状态）
  - TM结束分布式事务，事务一阶段结束（TM通知TC提交/回滚分布式事务）
  - TC汇总事务信息，决定分布式事务是提交还是回滚
  - TC通知所有RM提交/回滚资源，事务二阶段结束。
AT模式如何做到对业务的无侵入
- 是什么
- 一阶段加载
- 二阶段提交
- 二阶段回滚
debug
补充

XMind - Trial Version

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